Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: btrfs: harden block_group::bg_list against list_del() races As far as I can tell, these calls of list_del_init() on bg_list cannot run concurrently with btrfs_mark_bg_unused() or btrfs_mark_bg_to_reclaim(), as they are in transaction error paths and situations where the block group is readonly. However, if there is any chance at all of racing with mark_bg_unused(), or a different future user of bg_list, better to be safe than sorry. Otherwise we risk the following interleaving (bg_list refcount in parens) T1 (some random op) T2 (btrfs_mark_bg_unused) !list_empty(&bg->bg_list); (1) list_del_init(&bg->bg_list); (1) list_move_tail (1) btrfs_put_block_group (0) btrfs_delete_unused_bgs bg = list_first_entry list_del_init(&bg->bg_list); btrfs_put_block_group(bg); (-1) Ultimately, this results in a broken ref count that hits zero one deref early and the real final deref underflows the refcount, resulting in a WARNING.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a9f189716cf15913c453299d72f69c51a9b0f86b before 9039afe6240ae01d6caf2fa731590ac74fb8a69b; affected a9f189716cf15913c453299d72f69c51a9b0f86b before bf089c4d1141b27332c092b1dcca5022c415a3b6; affected a9f189716cf15913c453299d72f69c51a9b0f86b before 909e60fb469d4101c6b08cf6e622efb062bb24a1; affected a9f189716cf15913c453299d72f69c51a9b0f86b before 185fd73e5ac06027c4be9a129e59193f6a3ef202; affected a9f189716cf15913c453299d72f69c51a9b0f86b before 7511e29cf1355b2c47d0effb39e463119913e2f6; affected edf3b5aadb2515c808200b904baa5b70a727f0ac; affected 01eca70ef8cf499d0cb6d1bbd691558e7792cf17; affected 5d19abcffd8404078dfa7d7118cec357b5e7bc58; affected 5.15.128 before 5.16; affected 6.1.47 before 6.2; affected 6.4.12 before 6.5 |
| Linux / Linux | affected 6.5; unaffected 0 before 6.5; unaffected 6.6.160 through 6.6.*; unaffected 6.12.24 through 6.12.*; unaffected 6.13.12 through 6.13.*; unaffected 6.14.3 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9039afe6240ae01d6caf2fa731590ac74fb8a69b
- https://git.kernel.org/stable/c/bf089c4d1141b27332c092b1dcca5022c415a3b6
- https://git.kernel.org/stable/c/909e60fb469d4101c6b08cf6e622efb062bb24a1
- https://git.kernel.org/stable/c/185fd73e5ac06027c4be9a129e59193f6a3ef202
- https://git.kernel.org/stable/c/7511e29cf1355b2c47d0effb39e463119913e2f6