ghsa-24gv-qfv8-v7f5
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
ext4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free
When calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(), the 'ppath' is updated but it is the 'path' that is freed, thus potentially triggering a double-free in the following process:
ext4_ext_replay_update_ex ppath = path ext4_force_split_extent_at(&ppath) ext4_split_extent_at ext4_ext_insert_extent ext4_ext_create_new_leaf ext4_ext_grow_indepth ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path) ---> path First freed *orig_path = path = NULL ---> null ppath kfree(path) ---> path double-free !!!
So drop the unnecessary ppath and use path directly to avoid this problem. And use ext4_find_extent() directly to update path, avoiding unnecessary memory allocation and freeing. Also, propagate the error returned by ext4_find_extent() instead of using strange error codes.
{
"affected": [],
"aliases": [
"CVE-2024-49983"
],
"database_specific": {
"cwe_ids": [
"CWE-415"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-21T18:15:18Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: drop ppath from ext4_ext_replay_update_ex() to avoid double-free\n\nWhen calling ext4_force_split_extent_at() in ext4_ext_replay_update_ex(),\nthe \u0027ppath\u0027 is updated but it is the \u0027path\u0027 that is freed, thus potentially\ntriggering a double-free in the following process:\n\next4_ext_replay_update_ex\n ppath = path\n ext4_force_split_extent_at(\u0026ppath)\n ext4_split_extent_at\n ext4_ext_insert_extent\n ext4_ext_create_new_leaf\n ext4_ext_grow_indepth\n ext4_find_extent\n if (depth \u003e path[0].p_maxdepth)\n kfree(path) ---\u003e path First freed\n *orig_path = path = NULL ---\u003e null ppath\n kfree(path) ---\u003e path double-free !!!\n\nSo drop the unnecessary ppath and use path directly to avoid this problem.\nAnd use ext4_find_extent() directly to update path, avoiding unnecessary\nmemory allocation and freeing. Also, propagate the error returned by\next4_find_extent() instead of using strange error codes.",
"id": "GHSA-24gv-qfv8-v7f5",
"modified": "2024-10-29T18:30:35Z",
"published": "2024-10-21T18:30:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49983"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b558006d98b7b0b730027be0ee98973dd10ee0d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ff710662e8d86a63a39b334e9ca0cb10e5c14b0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6367d3f04c69e2b8770b8137bd800e0784b0abbc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/63adc9016917e6970fb0104ee5fd6770f02b2d80"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c26d9e53e5fbacda0732a577e97c5a5b7882aaf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a34bed978364114390162c27e50fca50791c568d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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