CVE-2024-50265 (GCVE-0-2024-50265)
Vulnerability from cvelistv5
Published
2024-11-19 01:30
Modified
2026-05-11 20:48
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove() Syzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove(): [ 57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12 [ 57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper. Leaking 1 clusters and removing the entry [ 57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004 [...] [ 57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [...] [ 57.331328] Call Trace: [ 57.331477] <TASK> [...] [ 57.333511] ? do_user_addr_fault+0x3e5/0x740 [ 57.333778] ? exc_page_fault+0x70/0x170 [ 57.334016] ? asm_exc_page_fault+0x2b/0x30 [ 57.334263] ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10 [ 57.334596] ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0 [ 57.334913] ocfs2_xa_remove_entry+0x23/0xc0 [ 57.335164] ocfs2_xa_set+0x704/0xcf0 [ 57.335381] ? _raw_spin_unlock+0x1a/0x40 [ 57.335620] ? ocfs2_inode_cache_unlock+0x16/0x20 [ 57.335915] ? trace_preempt_on+0x1e/0x70 [ 57.336153] ? start_this_handle+0x16c/0x500 [ 57.336410] ? preempt_count_sub+0x50/0x80 [ 57.336656] ? _raw_read_unlock+0x20/0x40 [ 57.336906] ? start_this_handle+0x16c/0x500 [ 57.337162] ocfs2_xattr_block_set+0xa6/0x1e0 [ 57.337424] __ocfs2_xattr_set_handle+0x1fd/0x5d0 [ 57.337706] ? ocfs2_start_trans+0x13d/0x290 [ 57.337971] ocfs2_xattr_set+0xb13/0xfb0 [ 57.338207] ? dput+0x46/0x1c0 [ 57.338393] ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338665] ? ocfs2_xattr_trusted_set+0x28/0x30 [ 57.338948] __vfs_removexattr+0x92/0xc0 [ 57.339182] __vfs_removexattr_locked+0xd5/0x190 [ 57.339456] ? preempt_count_sub+0x50/0x80 [ 57.339705] vfs_removexattr+0x5f/0x100 [...] Reproducer uses faultinject facility to fail ocfs2_xa_remove() -> ocfs2_xa_value_truncate() with -ENOMEM. In this case the comment mentions that we can return 0 if ocfs2_xa_cleanup_value_truncate() is going to wipe the entry anyway. But the following 'rc' check is wrong and execution flow do 'ocfs2_xa_remove_entry(loc);' twice: * 1st: in ocfs2_xa_cleanup_value_truncate(); * 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'. Fix this by skipping the 2nd removal of the same entry and making syzkaller repro happy.
References
Impacted products
Vendor Product Version
Linux Linux Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
Version: 399ff3a748cf4c8c853e96dd477153202636527b
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()\n\nSyzkaller is able to provoke null-ptr-dereference in ocfs2_xa_remove():\n\n[   57.319872] (a.out,1161,7):ocfs2_xa_remove:2028 ERROR: status = -12\n[   57.320420] (a.out,1161,7):ocfs2_xa_cleanup_value_truncate:1999 ERROR: Partial truncate while removing xattr overlay.upper.  Leaking 1 clusters and removing the entry\n[   57.321727] BUG: kernel NULL pointer dereference, address: 0000000000000004\n[...]\n[   57.325727] RIP: 0010:ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[...]\n[   57.331328] Call Trace:\n[   57.331477]  \u003cTASK\u003e\n[...]\n[   57.333511]  ? do_user_addr_fault+0x3e5/0x740\n[   57.333778]  ? exc_page_fault+0x70/0x170\n[   57.334016]  ? asm_exc_page_fault+0x2b/0x30\n[   57.334263]  ? __pfx_ocfs2_xa_block_wipe_namevalue+0x10/0x10\n[   57.334596]  ? ocfs2_xa_block_wipe_namevalue+0x2a/0xc0\n[   57.334913]  ocfs2_xa_remove_entry+0x23/0xc0\n[   57.335164]  ocfs2_xa_set+0x704/0xcf0\n[   57.335381]  ? _raw_spin_unlock+0x1a/0x40\n[   57.335620]  ? ocfs2_inode_cache_unlock+0x16/0x20\n[   57.335915]  ? trace_preempt_on+0x1e/0x70\n[   57.336153]  ? start_this_handle+0x16c/0x500\n[   57.336410]  ? preempt_count_sub+0x50/0x80\n[   57.336656]  ? _raw_read_unlock+0x20/0x40\n[   57.336906]  ? start_this_handle+0x16c/0x500\n[   57.337162]  ocfs2_xattr_block_set+0xa6/0x1e0\n[   57.337424]  __ocfs2_xattr_set_handle+0x1fd/0x5d0\n[   57.337706]  ? ocfs2_start_trans+0x13d/0x290\n[   57.337971]  ocfs2_xattr_set+0xb13/0xfb0\n[   57.338207]  ? dput+0x46/0x1c0\n[   57.338393]  ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338665]  ? ocfs2_xattr_trusted_set+0x28/0x30\n[   57.338948]  __vfs_removexattr+0x92/0xc0\n[   57.339182]  __vfs_removexattr_locked+0xd5/0x190\n[   57.339456]  ? preempt_count_sub+0x50/0x80\n[   57.339705]  vfs_removexattr+0x5f/0x100\n[...]\n\nReproducer uses faultinject facility to fail ocfs2_xa_remove() -\u003e\nocfs2_xa_value_truncate() with -ENOMEM.\n\nIn this case the comment mentions that we can return 0 if\nocfs2_xa_cleanup_value_truncate() is going to wipe the entry\nanyway. But the following \u0027rc\u0027 check is wrong and execution flow do\n\u0027ocfs2_xa_remove_entry(loc);\u0027 twice:\n* 1st: in ocfs2_xa_cleanup_value_truncate();\n* 2nd: returning back to ocfs2_xa_remove() instead of going to \u0027out\u0027.\n\nFix this by skipping the 2nd removal of the same entry and making\nsyzkaller repro happy."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:48:46.700Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/38cbf13b2e7a31362babe411f7c2c3c52cd2734b"
        },
        {
          "url": "https://git.kernel.org/stable/c/168a9b8303fcb0317db4c06b23ce1c0ce2af4e10"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a7e6dcf90fe7721d0863067b6ca9a9442134692"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcc8fe8c83145041cb6c80cac21f6173a3ff0204"
        },
        {
          "url": "https://git.kernel.org/stable/c/86dd0e8d42828923c68ad506933336bcd6f2317d"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd73c942eed76a014c7a5597e6926435274d2c4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b5369528ee63c88371816178a05b5e664c87386"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b63c0e01fba40e3992bc627272ec7b618ccaef7"
        }
      ],
      "title": "ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50265",
    "datePublished": "2024-11-19T01:30:00.861Z",
    "dateReserved": "2024-10-21T19:36:19.982Z",
    "dateUpdated": "2026-05-11T20:48:46.700Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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