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

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[ 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@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240104142040.2835097-6-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 22:20:37 +08:00 committed by Greg Kroah-Hartman
parent 720751b57f
commit f32d2a745b
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/mballoc.c
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@ -841,7 +841,7 @@ 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,