Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map leak in NOCOW direct I/O write btrfs_dio_iomap_begin() calls btrfs_get_extent(), which returns an extent map reference that must be dropped on all exit paths. For direct writes into a NOCOW range, btrfs_get_blocks_direct_write() keeps using that extent map and asks btrfs_create_dio_extent() to allocate the ordered extent. If that fails, for example because btrfs_alloc_ordered_extent() fails, the function returns the error without dropping the input extent map. The PREALLOC path avoided this by dropping the input extent map before replacing it with the newly created one. Check the error from btrfs_create_dio_extent() before replacing the map and drop the input extent map on failure.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af before cb732d302245b14943a5017015fffa8e6db7a6c0; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af before b7c873765875645b11503f94c9bae2ca80127375; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af before f42efd634c0ae7ba0ce2fc5e30e291b0803b0ae2; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af before 05a1a816eef8b3e4332620a64fc8cf45c4eb5c0d; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af before 3f950867c307c5413d628a153ac44915bd117ffd |
| Linux / Linux | affected 4.7; unaffected 0 before 4.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/cb732d302245b14943a5017015fffa8e6db7a6c0
- https://git.kernel.org/stable/c/b7c873765875645b11503f94c9bae2ca80127375
- https://git.kernel.org/stable/c/f42efd634c0ae7ba0ce2fc5e30e291b0803b0ae2
- https://git.kernel.org/stable/c/05a1a816eef8b3e4332620a64fc8cf45c4eb5c0d
- https://git.kernel.org/stable/c/3f950867c307c5413d628a153ac44915bd117ffd