CVE-2024-44963 - "Btrfs Memory Leak BUG Abuse Vulnerability"

CVE-2024-44963 - "Btrfs Memory Leak BUG Abuse Vulnerability"

https://cvefeed.io/rssfeed/latest.atom / Wed, 09/04/2024 - 22:28
CVE ID : CVE-2024-44963
Published : Sept. 4, 2024, 7:15 p.m. | 1 hour, 12 minutes ago
Description : 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.
Severity: 0.0 | NA
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