cve-2022-49007
Vulnerability from cvelistv5
Published
2024-10-21 20:06
Modified
2024-12-19 08:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry() Syzbot reported a null-ptr-deref bug: NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 3603 Comm: segctord Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0 fs/nilfs2/alloc.c:608 Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7 RSP: 0018:ffffc90003dff830 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010 RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158 R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0 Call Trace: <TASK> nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline] nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193 nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236 nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940 nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline] nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline] nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088 nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337 nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568 nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018 nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline] nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> ... If DAT metadata file is corrupted on disk, there is a case where req->pr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during a b-tree operation that cascadingly updates ancestor nodes of the b-tree, because nilfs_dat_commit_alloc() for a lower level block can initialize the blocknr on the same DAT entry between nilfs_dat_prepare_end() and nilfs_dat_commit_end(). If this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free() without valid buffer heads in req->pr_desc_bh and req->pr_bitmap_bh, and causes the NULL pointer dereference above in nilfs_palloc_commit_free_entry() function, which leads to a crash. Fix this by adding a NULL check on req->pr_desc_bh and req->pr_bitmap_bh before nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free(). This also calls nilfs_error() in that case to notify that there is a fatal flaw in the filesystem metadata and prevent further operations.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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              "content": {
                "id": "CVE-2022-49007",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                "timestamp": "2024-10-22T13:14:21.732997Z",
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        "title": "CISA ADP Vulnrichment"
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          "product": "Linux",
          "programFiles": [
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "4.9.335",
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              "version": "4.14.301",
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              "version": "6.1",
              "versionType": "original_commit_for_fix"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()\n\nSyzbot reported a null-ptr-deref bug:\n\n NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP\n frequency \u003c 30 seconds\n general protection fault, probably for non-canonical address\n 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n CPU: 1 PID: 3603 Comm: segctord Not tainted\n 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google\n 10/11/2022\n RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0\n fs/nilfs2/alloc.c:608\n Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00\n 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02\n 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7\n RSP: 0018:ffffc90003dff830 EFLAGS: 00010212\n RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d\n RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010\n RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f\n R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158\n R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004\n FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000)\n knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0\n Call Trace:\n  \u003cTASK\u003e\n  nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline]\n  nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193\n  nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236\n  nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940\n  nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline]\n  nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline]\n  nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088\n  nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337\n  nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568\n  nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018\n  nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067\n  nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]\n  nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline]\n  nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045\n  nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379\n  nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]\n  nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570\n  kthread+0x2e4/0x3a0 kernel/kthread.c:376\n  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n  \u003c/TASK\u003e\n ...\n\nIf DAT metadata file is corrupted on disk, there is a case where\nreq-\u003epr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during\na b-tree operation that cascadingly updates ancestor nodes of the b-tree,\nbecause nilfs_dat_commit_alloc() for a lower level block can initialize\nthe blocknr on the same DAT entry between nilfs_dat_prepare_end() and\nnilfs_dat_commit_end().\n\nIf this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free()\nwithout valid buffer heads in req-\u003epr_desc_bh and req-\u003epr_bitmap_bh, and\ncauses the NULL pointer dereference above in\nnilfs_palloc_commit_free_entry() function, which leads to a crash.\n\nFix this by adding a NULL check on req-\u003epr_desc_bh and req-\u003epr_bitmap_bh\nbefore nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free().\n\nThis also calls nilfs_error() in that case to notify that there is a fatal\nflaw in the filesystem metadata and prevent further operations."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T08:12:19.820Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63"
        },
        {
          "url": "https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68"
        },
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          "url": "https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89"
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          "url": "https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07"
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          "url": "https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847"
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          "url": "https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756"
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          "url": "https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4"
        }
      ],
      "title": "nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49007",
    "datePublished": "2024-10-21T20:06:19.506Z",
    "dateReserved": "2024-08-22T01:27:53.643Z",
    "dateUpdated": "2024-12-19T08:12:19.820Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49007\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:12.197\",\"lastModified\":\"2024-10-25T14:35:25.910\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()\\n\\nSyzbot reported a null-ptr-deref bug:\\n\\n NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP\\n frequency \u003c 30 seconds\\n general protection fault, probably for non-canonical address\\n 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN\\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\\n CPU: 1 PID: 3603 Comm: segctord Not tainted\\n 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0\\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google\\n 10/11/2022\\n RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0\\n fs/nilfs2/alloc.c:608\\n Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00\\n 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02\\n 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7\\n RSP: 0018:ffffc90003dff830 EFLAGS: 00010212\\n RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d\\n RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010\\n RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f\\n R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158\\n R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004\\n FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000)\\n knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0\\n Call Trace:\\n  \u003cTASK\u003e\\n  nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline]\\n  nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193\\n  nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236\\n  nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940\\n  nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline]\\n  nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline]\\n  nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088\\n  nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337\\n  nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568\\n  nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018\\n  nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067\\n  nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]\\n  nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline]\\n  nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045\\n  nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379\\n  nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]\\n  nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570\\n  kthread+0x2e4/0x3a0 kernel/kthread.c:376\\n  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\\n  \u003c/TASK\u003e\\n ...\\n\\nIf DAT metadata file is corrupted on disk, there is a case where\\nreq-\u003epr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during\\na b-tree operation that cascadingly updates ancestor nodes of the b-tree,\\nbecause nilfs_dat_commit_alloc() for a lower level block can initialize\\nthe blocknr on the same DAT entry between nilfs_dat_prepare_end() and\\nnilfs_dat_commit_end().\\n\\nIf this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free()\\nwithout valid buffer heads in req-\u003epr_desc_bh and req-\u003epr_bitmap_bh, and\\ncauses the NULL pointer dereference above in\\nnilfs_palloc_commit_free_entry() function, which leads to a crash.\\n\\nFix this by adding a NULL check on req-\u003epr_desc_bh and req-\u003epr_bitmap_bh\\nbefore nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free().\\n\\nThis also calls nilfs_error() in that case to notify that there is a fatal\\nflaw in the filesystem metadata and prevent further operations.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: corrige la desreferencia de puntero NULL en nilfs_palloc_commit_free_entry() Syzbot inform\u00f3 un error de desreferencia de puntero nulo: NILFS (loop0): segctord iniciando. Intervalo de construcci\u00f3n = 5 segundos, frecuencia de CP \u0026lt; 30 segundos. fallo de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref en rango [0x000000000000010-0x0000000000000017] CPU: 1 PID: 3603 Comm: segctord No contaminado 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Nombre del hardware: Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0 fs/nilfs2/alloc.c:608 C\u00f3digo: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 \u0026lt;80\u0026gt; 3c 02 00 0f 85 26 05 00 00 49 8b 46 10 ser a6 00 00 00 48 c7 c7 RSP: 0018:ffffc90003dff830 EFLAGS: 00010212 RAX: dffffc00000000000 RBX: ffff88802594e218 RCX: 000000000000000d RDX: 00000000000000002 RSI: 0000000000002000 RDI: 0000000000000010 RBP: ffff888071880222 R08: 000000000000005 R09: 000000000000003f R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158 R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004 FS: 000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0 Seguimiento de llamadas:  nilfs_dat_commit_free fs/nilfs2/dat.c:114 [en l\u00ednea] nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193 nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236 nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940 nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [en l\u00ednea] nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [en l\u00ednea] nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088 nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337 nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568 nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018 nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [en l\u00ednea] nilfs_segctor_collect fs/nilfs2/segment.c:1503 [en l\u00ednea] nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [en l\u00ednea] nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306  ... Si el archivo de metadatos DAT est\u00e1 da\u00f1ado en el disco, existe un caso en el que req-\u0026gt;pr_desc_bh es NULL y blocknr es 0 en nilfs_dat_commit_end() durante una operaci\u00f3n de \u00e1rbol b que actualiza en cascada los nodos ancestros del \u00e1rbol b, porque nilfs_dat_commit_alloc() para un bloque de nivel inferior puede inicializar el blocknr en la misma entrada DAT entre nilfs_dat_prepare_end() y nilfs_dat_commit_end(). Si esto sucede, nilfs_dat_commit_end() llama a nilfs_dat_commit_free() sin encabezados de b\u00fafer v\u00e1lidos en req-\u0026gt;pr_desc_bh y req-\u0026gt;pr_bitmap_bh, y provoca la desreferencia del puntero NULL anterior en la funci\u00f3n nilfs_palloc_commit_free_entry(), lo que provoca un bloqueo. Solucione este problema agregando una comprobaci\u00f3n NULL en req-\u0026gt;pr_desc_bh y req-\u0026gt;pr_bitmap_bh antes de nilfs_palloc_commit_free_entry() en nilfs_dat_commit_free(). Esto tambi\u00e9n llama a nilfs_error() en ese caso para notificar que hay un fallo fatal en los metadatos del sistema de archivos y evitar operaciones futuras.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.9.335\",\"matchCriteriaId\":\"136389E3-6553-4B2F-94DB-15BC9CE17183\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.301\",\"matchCriteriaId\":\"0EE18A3A-1E78-44D6-9FDB-B267E4819993\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.268\",\"matchCriteriaId\":\"04705C94-71FA-46AB-AF73-B551892B0EBA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.226\",\"matchCriteriaId\":\"274F5087-5805-4D03-8C74-8517300658F1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.158\",\"matchCriteriaId\":\"D0FB1AF1-0A0B-4419-B25F-C61F17380E18\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.82\",\"matchCriteriaId\":\"0DC20DB6-73C1-4465-B931-117BFB8EBB02\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.0.12\",\"matchCriteriaId\":\"D6D56E90-F3EE-413D-B3E2-B518932F0C7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7E331DA-1FB0-4DEC-91AC-7DA69D461C11\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"17F0B248-42CF-4AE6-A469-BB1BAE7F4705\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E2422816-0C14-4B5E-A1E6-A9D776E5C49B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"35B26BE4-43A6-4A36-A7F6-5B3F572D9186\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3FFFB0B3-930D-408A-91E2-BAE0C2715D80\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"8535320E-A0DB-4277-800E-D0CE5BBA59E8\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49007\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:14:21.732997Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:14:25.282Z\"}}], \"cna\": {\"title\": \"nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"2f2c59506ae39496588ceb8b88bdbdbaed895d63\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"165c7a3b27a3857ebf57f626b9f38b48b6792e68\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"bc3fd3293887b4cf84a9109700faeb82de533c89\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"9a130b72e6bd1fb07fc3cde839dc6fb53da76f07\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"e858917ab785afe83c14f5ac141301216ccda847\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"33021419fd81efd3d729a7f19341ba4b98fe66ce\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"381b84f60e549ea98cec4666c6c728b1b3318756\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nilfs2/dat.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"4.9.335\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.301\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.268\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.226\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.158\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nilfs2/dat.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2f2c59506ae39496588ceb8b88bdbdbaed895d63\"}, {\"url\": \"https://git.kernel.org/stable/c/165c7a3b27a3857ebf57f626b9f38b48b6792e68\"}, {\"url\": \"https://git.kernel.org/stable/c/bc3fd3293887b4cf84a9109700faeb82de533c89\"}, {\"url\": \"https://git.kernel.org/stable/c/9a130b72e6bd1fb07fc3cde839dc6fb53da76f07\"}, {\"url\": \"https://git.kernel.org/stable/c/e858917ab785afe83c14f5ac141301216ccda847\"}, {\"url\": \"https://git.kernel.org/stable/c/33021419fd81efd3d729a7f19341ba4b98fe66ce\"}, {\"url\": \"https://git.kernel.org/stable/c/381b84f60e549ea98cec4666c6c728b1b3318756\"}, {\"url\": \"https://git.kernel.org/stable/c/f0a0ccda18d6fd826d7c7e7ad48a6ed61c20f8b4\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()\\n\\nSyzbot reported a null-ptr-deref bug:\\n\\n NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP\\n frequency \u003c 30 seconds\\n general protection fault, probably for non-canonical address\\n 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN\\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\\n CPU: 1 PID: 3603 Comm: segctord Not tainted\\n 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0\\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google\\n 10/11/2022\\n RIP: 0010:nilfs_palloc_commit_free_entry+0xe5/0x6b0\\n fs/nilfs2/alloc.c:608\\n Code: 00 00 00 00 fc ff df 80 3c 02 00 0f 85 cd 05 00 00 48 b8 00 00 00\\n 00 00 fc ff df 4c 8b 73 08 49 8d 7e 10 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02\\n 00 0f 85 26 05 00 00 49 8b 46 10 be a6 00 00 00 48 c7 c7\\n RSP: 0018:ffffc90003dff830 EFLAGS: 00010212\\n RAX: dffffc0000000000 RBX: ffff88802594e218 RCX: 000000000000000d\\n RDX: 0000000000000002 RSI: 0000000000002000 RDI: 0000000000000010\\n RBP: ffff888071880222 R08: 0000000000000005 R09: 000000000000003f\\n R10: 000000000000000d R11: 0000000000000000 R12: ffff888071880158\\n R13: ffff88802594e220 R14: 0000000000000000 R15: 0000000000000004\\n FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000)\\n knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 00007fb1c08316a8 CR3: 0000000018560000 CR4: 0000000000350ee0\\n Call Trace:\\n  \u003cTASK\u003e\\n  nilfs_dat_commit_free fs/nilfs2/dat.c:114 [inline]\\n  nilfs_dat_commit_end+0x464/0x5f0 fs/nilfs2/dat.c:193\\n  nilfs_dat_commit_update+0x26/0x40 fs/nilfs2/dat.c:236\\n  nilfs_btree_commit_update_v+0x87/0x4a0 fs/nilfs2/btree.c:1940\\n  nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline]\\n  nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline]\\n  nilfs_btree_propagate+0xa00/0xd60 fs/nilfs2/btree.c:2088\\n  nilfs_bmap_propagate+0x73/0x170 fs/nilfs2/bmap.c:337\\n  nilfs_collect_file_data+0x45/0xd0 fs/nilfs2/segment.c:568\\n  nilfs_segctor_apply_buffers+0x14a/0x470 fs/nilfs2/segment.c:1018\\n  nilfs_segctor_scan_file+0x3f4/0x6f0 fs/nilfs2/segment.c:1067\\n  nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]\\n  nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline]\\n  nilfs_segctor_do_construct+0x12fc/0x6af0 fs/nilfs2/segment.c:2045\\n  nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2379\\n  nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]\\n  nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2570\\n  kthread+0x2e4/0x3a0 kernel/kthread.c:376\\n  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\\n  \u003c/TASK\u003e\\n ...\\n\\nIf DAT metadata file is corrupted on disk, there is a case where\\nreq-\u003epr_desc_bh is NULL and blocknr is 0 at nilfs_dat_commit_end() during\\na b-tree operation that cascadingly updates ancestor nodes of the b-tree,\\nbecause nilfs_dat_commit_alloc() for a lower level block can initialize\\nthe blocknr on the same DAT entry between nilfs_dat_prepare_end() and\\nnilfs_dat_commit_end().\\n\\nIf this happens, nilfs_dat_commit_end() calls nilfs_dat_commit_free()\\nwithout valid buffer heads in req-\u003epr_desc_bh and req-\u003epr_bitmap_bh, and\\ncauses the NULL pointer dereference above in\\nnilfs_palloc_commit_free_entry() function, which leads to a crash.\\n\\nFix this by adding a NULL check on req-\u003epr_desc_bh and req-\u003epr_bitmap_bh\\nbefore nilfs_palloc_commit_free_entry() in nilfs_dat_commit_free().\\n\\nThis also calls nilfs_error() in that case to notify that there is a fatal\\nflaw in the filesystem metadata and prevent further operations.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:12:19.820Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49007\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:12:19.820Z\", \"dateReserved\": \"2024-08-22T01:27:53.643Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:06:19.506Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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