{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50265",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50265"
  ],
  "published": "2024-11-19T01:35:04Z",
  "summary": "ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove()",
  "details": "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]  <TASK>\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() ->\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 'rc' check is wrong and execution flow do\n'ocfs2_xa_remove_entry(loc);' twice:\n* 1st: in ocfs2_xa_cleanup_value_truncate();\n* 2nd: returning back to ocfs2_xa_remove() instead of going to 'out'.\n\nFix this by skipping the 2nd removal of the same entry and making\nsyzkaller repro happy.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50265"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38cbf13b2e7a31362babe411f7c2c3c52cd2734b"
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      "url": "https://git.kernel.org/stable/c/168a9b8303fcb0317db4c06b23ce1c0ce2af4e10"
    },
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      "url": "https://git.kernel.org/stable/c/6a7e6dcf90fe7721d0863067b6ca9a9442134692"
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      "url": "https://git.kernel.org/stable/c/dcc8fe8c83145041cb6c80cac21f6173a3ff0204"
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86dd0e8d42828923c68ad506933336bcd6f2317d"
    },
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      "url": "https://git.kernel.org/stable/c/dd73c942eed76a014c7a5597e6926435274d2c4c"
    },
    {
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      "url": "https://git.kernel.org/stable/c/2b5369528ee63c88371816178a05b5e664c87386"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0b63c0e01fba40e3992bc627272ec7b618ccaef7"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}