{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: update orig_path in ext4_find_extent()\n\nIn ext4_find_extent(), if the path is not big enough, we free it and set\n*orig_path to NULL. But after reallocating and successfully initializing\nthe path, we don't update *orig_path, in which case the caller gets a\nvalid path but a NULL ppath, and this may cause a NULL pointer dereference\nor a path memory leak. For example:\n\next4_split_extent\n  path = *ppath = 2000\n  ext4_find_extent\n    if (depth > path[0].p_maxdepth)\n      kfree(path = 2000);\n      *orig_path = path = NULL;\n      path = kcalloc() = 3000\n  ext4_split_extent_at(*ppath = NULL)\n    path = *ppath;\n    ex = path[depth].p_ext;\n    // NULL pointer dereference!\n\n==================================================================\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nCPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847\nRIP: 0010:ext4_split_extent_at+0x6d/0x560\nCall Trace:\n <TASK>\n ext4_split_extent.isra.0+0xcb/0x1b0\n ext4_ext_convert_to_initialized+0x168/0x6c0\n ext4_ext_handle_unwritten_extents+0x325/0x4d0\n ext4_ext_map_blocks+0x520/0xdb0\n ext4_map_blocks+0x2b0/0x690\n ext4_iomap_begin+0x20e/0x2c0\n[...]\n==================================================================\n\nTherefore, *orig_path is updated when the extent lookup succeeds, so that\nthe caller can safely use path or *ppath."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/ext4/extents.c",
                  "fs/ext4/move_extent.c"
               ],
               "versions": [
                  {
                     "version": "10809df84a4d",
                     "lessThan": "6766937d0327",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "a9fcb1717d75",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "6801ed129820",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "f55ecc58d07a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "b63481b3a388",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "11b230100d68",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "10809df84a4d",
                     "lessThan": "5b4b2dcace35",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/ext4/extents.c",
                  "fs/ext4/move_extent.c"
               ],
               "versions": [
                  {
                     "version": "3.18",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "3.18",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.227",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.168",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.113",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.55",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10.14",
                     "lessThanOrEqual": "6.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.11.3",
                     "lessThanOrEqual": "6.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.12-rc1",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599"
            },
            {
               "url": "https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd"
            },
            {
               "url": "https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679"
            },
            {
               "url": "https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2"
            },
            {
               "url": "https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42"
            },
            {
               "url": "https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96"
            },
            {
               "url": "https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1"
            }
         ],
         "title": "ext4: update orig_path in ext4_find_extent()",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-49881",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}