cve-2021-47585
Vulnerability from cvelistv5
Published
2024-06-19 14:53
Modified
2024-12-19 07:45
Severity ?
EPSS score ?
0.04% (0.08003)
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory leak in __add_inode_ref() Line 1169 (#3) allocates a memory chunk for victim_name by kmalloc(), but when the function returns in line 1184 (#4) victim_name allocated by line 1169 (#3) is not freed, which will lead to a memory leak. There is a similar snippet of code in this function as allocating a memory chunk for victim_name in line 1104 (#1) as well as releasing the memory in line 1116 (#2). We should kfree() victim_name when the return value of backref_in_log() is less than zero and before the function returns in line 1184 (#4). 1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans, 1058 struct btrfs_root *root, 1059 struct btrfs_path *path, 1060 struct btrfs_root *log_root, 1061 struct btrfs_inode *dir, 1062 struct btrfs_inode *inode, 1063 u64 inode_objectid, u64 parent_objectid, 1064 u64 ref_index, char *name, int namelen, 1065 int *search_done) 1066 { 1104 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #1: kmalloc (victim_name-1) 1105 if (!victim_name) 1106 return -ENOMEM; 1112 ret = backref_in_log(log_root, &search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret < 0) { 1116 kfree(victim_name); // #2: kfree (victim_name-1) 1117 return ret; 1118 } else if (!ret) { 1169 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #3: kmalloc (victim_name-2) 1170 if (!victim_name) 1171 return -ENOMEM; 1180 ret = backref_in_log(log_root, &search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 if (ret < 0) { 1184 return ret; // #4: missing kfree (victim_name-2) 1185 } else if (!ret) { 1241 return 0; 1242 }
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665Patch
Impacted products
Vendor Product Version
Linux Linux Version: d3316c8233bb05e0dd855d30aac347bb8ad76ee4
Version: d3316c8233bb05e0dd855d30aac347bb8ad76ee4
Version: d3316c8233bb05e0dd855d30aac347bb8ad76ee4
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   Linux Linux Version: 5.5
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Hay un fragmento de código similar en esta función para asignar un fragmento de memoria para victim_name en la línea 1104 (n.º 1), así como para liberar la memoria en la línea 1116 (n.º 2). Deberíamos kfree() victim_name cuando el valor de retorno de backref_in_log() sea menor que cero y antes de que la función regrese en la línea 1184 (#4). 1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans, 1058 struct btrfs_root *root, 1059 struct btrfs_path *path, 1060 struct btrfs_root *log_root, 1061 struct btrfs_inode *dir, 1062 struct btrfs_inode *inode, 63 u64 inode_objectid, u64 parent_objectid, 1064 u64 ref_index, char *nombre, int nombrelen, 1065 int *search_done) 1066 { 1104 nombre_víctima = kmalloc(nombre_víctima_len, GFP_NOFS); // #1: kmalloc (nombre_víctima-1) 1105 if (!nombre_víctima) 1106 return -ENOMEM; 1112 ret = backref_in_log(log_root, &amp;search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret &lt; 0) { 1116 kfree(nombre_víctima); // #2: kfree (nombre_víctima-1) 1117 return ret; 1118 } else if (!ret) { 1169 nombre_víctima = kmalloc(nombre_víctima_len, GFP_NOFS); // #3: kmalloc (nombre_víctima-2) 1170 if (!nombre_víctima) 1171 return -ENOMEM; 1180 ret = backref_in_log(log_root, &amp;search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 si (ret &lt; 0) { 1184 retorno ret; // #4: falta kfree (nombre_víctima-2) 1185 } else if (!ret) { 1241 return 0; 1242 }\"}],\"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-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.88\",\"matchCriteriaId\":\"A657B2D0-5B9D-42BE-A3BF-228DBC1B057C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.11\",\"matchCriteriaId\":\"11274E95-438A-449A-B100-01B2B0046669\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
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// #2: kfree (victim_name-1)\\n1117\\t\\treturn ret;\\n1118\\t} else if (!ret) {\\n\\n1169 \\tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\\n\\t// #3: kmalloc (victim_name-2)\\n1170 \\tif (!victim_name)\\n1171 \\t\\treturn -ENOMEM;\\n\\n1180 \\tret = backref_in_log(log_root, &search_key,\\n1181 \\t\\t\\tparent_objectid, victim_name,\\n1182 \\t\\t\\tvictim_name_len);\\n1183 \\tif (ret < 0) {\\n1184 \\t\\treturn ret; // #4: missing kfree (victim_name-2)\\n1185 \\t} else if (!ret) {\\n\\n1241 \\treturn 0;\\n1242 }\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:45:15.543Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2021-47585\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:45:15.543Z\", \"dateReserved\": \"2024-05-24T15:11:00.731Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T14:53:50.780Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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