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ext4: do not trim the group with corrupted block bitmap

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[ Upstream commit 172202152a ]

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>
This commit is contained in:
Baokun Li 2024-01-04 22:20:34 +08:00 committed by Greg Kroah-Hartman
parent 5b7766ab91
commit 0a56dcce6b
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/mballoc.c
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@ -6953,6 +6953,9 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group))
bool set_trimmed = false; bool set_trimmed = false;
void *bitmap; void *bitmap;
if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
return 0;
last = ext4_last_grp_cluster(sb, e4b->bd_group); last = ext4_last_grp_cluster(sb, e4b->bd_group);
bitmap = e4b->bd_bitmap; bitmap = e4b->bd_bitmap;
if (start == 0 && max >= last) if (start == 0 && max >= last)