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| author | Baokun Li <libaokun1@huawei.com> | 2024-01-04 22:20:37 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2024-01-18 10:50:24 -0500 |
| commit | 993bf0f4c393b3667830918f9247438a8f6fdb5b (patch) | |
| tree | e5c9929fc1164ac0404405527dab201682e26801 | |
| parent | 2331fd4a49864e1571b4f50aa3aa1536ed6220d0 (diff) | |
| download | linux-stable-993bf0f4c393b3667830918f9247438a8f6fdb5b.tar.gz linux-stable-993bf0f4c393b3667830918f9247438a8f6fdb5b.tar.bz2 linux-stable-993bf0f4c393b3667830918f9247438a8f6fdb5b.zip | |
ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt
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>
| -rw-r--r-- | fs/ext4/mballoc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index fa351aa323dc..751e31df0f10 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -842,7 +842,7 @@ 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, |