CVE-2022-49810 (GCVE-0-2022-49810)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-05-04 08:45
VLAI?
Title
netfs: Fix missing xas_retry() calls in xarray iteration
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing xas_retry() calls in xarray iteration netfslib has a number of places in which it performs iteration of an xarray whilst being under the RCU read lock. It *should* call xas_retry() as the first thing inside of the loop and do "continue" if it returns true in case the xarray walker passed out a special value indicating that the walk needs to be redone from the root[*]. Fix this by adding the missing retry checks. [*] I wonder if this should be done inside xas_find(), xas_next_node() and suchlike, but I'm told that's not an simple change to effect. This can cause an oops like that below. Note the faulting address - this is an internal value (|0x2) returned from xarray. BUG: kernel NULL pointer dereference, address: 0000000000000402 ... RIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs] ... Call Trace: netfs_rreq_assess+0xa6/0x240 [netfs] netfs_readpage+0x173/0x3b0 [netfs] ? init_wait_var_entry+0x50/0x50 filemap_read_page+0x33/0xf0 filemap_get_pages+0x2f2/0x3f0 filemap_read+0xaa/0x320 ? do_filp_open+0xb2/0x150 ? rmqueue+0x3be/0xe10 ceph_read_iter+0x1fe/0x680 [ceph] ? new_sync_read+0x115/0x1a0 new_sync_read+0x115/0x1a0 vfs_read+0xf3/0x180 ksys_read+0x5f/0xe0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Changes: ======== ver #2) - Changed an unsigned int to a size_t to reduce the likelihood of an overflow as per Willy's suggestion. - Added an additional patch to fix the maths.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3d3c95046742e4eebaa4b891b0b01cbbed94ebbd , < b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d (git)
Affected: 3d3c95046742e4eebaa4b891b0b01cbbed94ebbd , < 7e043a80b5dae5c2d2cf84031501de7827fd6c00 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing xas_retry() calls in xarray iteration\n\nnetfslib has a number of places in which it performs iteration of an xarray\nwhilst being under the RCU read lock.  It *should* call xas_retry() as the\nfirst thing inside of the loop and do \"continue\" if it returns true in case\nthe xarray walker passed out a special value indicating that the walk needs\nto be redone from the root[*].\n\nFix this by adding the missing retry checks.\n\n[*] I wonder if this should be done inside xas_find(), xas_next_node() and\n    suchlike, but I\u0027m told that\u0027s not an simple change to effect.\n\nThis can cause an oops like that below.  Note the faulting address - this\nis an internal value (|0x2) returned from xarray.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000402\n...\nRIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs]\n...\nCall Trace:\n netfs_rreq_assess+0xa6/0x240 [netfs]\n netfs_readpage+0x173/0x3b0 [netfs]\n ? init_wait_var_entry+0x50/0x50\n filemap_read_page+0x33/0xf0\n filemap_get_pages+0x2f2/0x3f0\n filemap_read+0xaa/0x320\n ? do_filp_open+0xb2/0x150\n ? rmqueue+0x3be/0xe10\n ceph_read_iter+0x1fe/0x680 [ceph]\n ? new_sync_read+0x115/0x1a0\n new_sync_read+0x115/0x1a0\n vfs_read+0xf3/0x180\n ksys_read+0x5f/0xe0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nChanges:\n========\nver #2)\n - Changed an unsigned int to a size_t to reduce the likelihood of an\n   overflow as per Willy\u0027s suggestion.\n - Added an additional patch to fix the maths."
        }
      ],
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        "dateUpdated": "2025-05-04T08:45:49.863Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e043a80b5dae5c2d2cf84031501de7827fd6c00"
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      "title": "netfs: Fix missing xas_retry() calls in xarray iteration",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49810",
    "datePublished": "2025-05-01T14:09:35.470Z",
    "dateReserved": "2025-05-01T14:05:17.226Z",
    "dateUpdated": "2025-05-04T08:45:49.863Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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