Patch "ext4: do not trim the group with corrupted block bitmap" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    ext4: do not trim the group with corrupted block bitmap

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ext4-do-not-trim-the-group-with-corrupted-block-bitm.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c4aed850fea42bc2e942505c0d3fdaa1362e1578
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date:   Thu Jan 4 22:20:34 2024 +0800

    ext4: do not trim the group with corrupted block bitmap
    
    [ 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>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 5dcc3cad5c7d3..75dbe40ed8f72 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5219,6 +5219,9 @@ 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)




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