diff options
| author | Kemeng Shi <shikemeng@huaweicloud.com> | 2023-08-01 17:31:55 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-08-03 17:47:29 +0300 |
| commit | a9ce5993a0f5c0887c8a1b4ffa3b8046fbcfdc93 (patch) | |
| tree | f4747c211ee7f5a627e936ab730f185408428745 /fs/ext4/mballoc.c | |
| parent | 304749c0d5e216479ea4d553ad04ba1390d5c707 (diff) | |
| download | linux-a9ce5993a0f5c0887c8a1b4ffa3b8046fbcfdc93.tar.xz | |
ext4: correct grp validation in ext4_mb_good_group
Group corruption check will access memory of grp and will trigger kernel
crash if grp is NULL. So do NULL check before corruption check.
Fixes: 5354b2af3406 ("ext4: allow ext4_get_group_info() to fail")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20230801143204.2284343-2-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index a2d791953da5..e07d2a4fbcd1 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2553,7 +2553,7 @@ static bool ext4_mb_good_group(struct ext4_allocation_context *ac, BUG_ON(cr < CR_POWER2_ALIGNED || cr >= EXT4_MB_NUM_CRS); - if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp) || !grp)) + if (unlikely(!grp || EXT4_MB_GRP_BBITMAP_CORRUPT(grp))) return false; free = grp->bb_free; |