Patch "ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt" has been added to the 6.1-stable tree

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

    ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt

to the 6.1-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-avoid-dividing-by-0-in-mb_update_avg_fragment_s.patch
and it can be found in the queue-6.1 subdirectory.

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



commit eb41d26887a89ac820b35b4d015f4b0f25fae712
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date:   Thu Jan 4 22:20:37 2024 +0800

    ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt
    
    [ Upstream commit 993bf0f4c393b3667830918f9247438a8f6fdb5b ]
    
    Determine if bb_fragments is 0 instead of determining bb_free to eliminate
    the risk of dividing by zero when the block bitmap is corrupted.
    
    Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
    Reviewed-by: Jan Kara <jack@xxxxxxx>
    Link: https://lore.kernel.org/r/20240104142040.2835097-6-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 1a310ee7d9e55..296185cbd1547 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -831,7 +831,7 @@ mb_update_avg_fragment_size(struct super_block *sb, struct ext4_group_info *grp)
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	int new_order;
 
-	if (!test_opt2(sb, MB_OPTIMIZE_SCAN) || grp->bb_free == 0)
+	if (!test_opt2(sb, MB_OPTIMIZE_SCAN) || grp->bb_fragments == 0)
 		return;
 
 	new_order = mb_avg_fragment_size_order(sb,




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