cve-2024-44963
Vulnerability from cvelistv5
Published
2024-09-04 18:36
Modified
2024-12-19 09:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON() when freeing tree block after error When freeing a tree block, at btrfs_free_tree_block(), if we fail to create a delayed reference we don't deal with the error and just do a BUG_ON(). The error most likely to happen is -ENOMEM, and we have a comment mentioning that only -ENOMEM can happen, but that is not true, because in case qgroups are enabled any error returned from btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned from btrfs_search_slot() for example) can be propagated back to btrfs_free_tree_block(). So stop doing a BUG_ON() and return the error to the callers and make them abort the transaction to prevent leaking space. Syzbot was triggering this, likely due to memory allocation failure injection.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22d907bcd283d69d5e60497fc0d51969545c583b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11Patch
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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              "content": {
                "id": "CVE-2024-44963",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:39:41.059166Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "cna": {
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            "fs/btrfs/free-space-tree.c",
            "fs/btrfs/ioctl.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not BUG_ON() when freeing tree block after error\n\nWhen freeing a tree block, at btrfs_free_tree_block(), if we fail to\ncreate a delayed reference we don\u0027t deal with the error and just do a\nBUG_ON(). The error most likely to happen is -ENOMEM, and we have a\ncomment mentioning that only -ENOMEM can happen, but that is not true,\nbecause in case qgroups are enabled any error returned from\nbtrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned\nfrom btrfs_search_slot() for example) can be propagated back to\nbtrfs_free_tree_block().\n\nSo stop doing a BUG_ON() and return the error to the callers and make\nthem abort the transaction to prevent leaking space. Syzbot was\ntriggering this, likely due to memory allocation failure injection."
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        "dateUpdated": "2024-12-19T09:19:13.079Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-44963",
    "datePublished": "2024-09-04T18:36:00.948Z",
    "dateReserved": "2024-08-21T05:34:56.667Z",
    "dateUpdated": "2024-12-19T09:19:13.079Z",
    "state": "PUBLISHED"
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