[PATCH 5.10 049/151] ext4: do not trim the group with corrupted block bitmap

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Baokun Li <libaokun1@xxxxxxxxxx>

[ Upstream commit 172202152a125955367393956acf5f4ffd092e0d ]

Otherwise operating on an incorrupted block bitmap can lead to all sorts
of unknown problems.

Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20240104142040.2835097-3-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/ext4/mballoc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index bc5db22df9fe7..7cbbcee225ddd 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5955,6 +5955,9 @@ static int ext4_try_to_trim_range(struct super_block *sb,
 	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)
-- 
2.43.0







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