5.15-stable review patch. If anyone has any objections, please let me know.
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From: Baokun Li libaokun1@huawei.com
[ Upstream commit 172202152a125955367393956acf5f4ffd092e0d ]
Otherwise operating on an incorrupted block bitmap can lead to all sorts of unknown problems.
Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20240104142040.2835097-3-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/mballoc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 630a5e5a380e2..a48c9cc5aa6e8 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -6496,6 +6496,9 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group)) bool set_trimmed = false; void *bitmap;
+ if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) + return 0; + last = ext4_last_grp_cluster(sb, e4b->bd_group); bitmap = e4b->bd_bitmap; if (start == 0 && max >= last)