ext4: do not trim the group with corrupted block bitmap

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>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index f44f668e407f2bda9fe325631c9a4ab62649b9dc..c86c90b494de3050935b9da0efdba9d68d5387fe 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6761,6 +6761,9 @@ __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)