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| author | Kemeng Shi <shikemeng@huaweicloud.com> | 2024-08-20 16:22:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-04 17:29:20 +0300 |
| commit | 9f70768554acf61327fc8352bd5ae313a72d68c4 (patch) | |
| tree | 0a4a75db7155d5051e5b822c6ec92d35d0cab652 /fs | |
| parent | fae0793abdab022c0778a2440108e8cd7bb6d7d0 (diff) | |
| download | linux-9f70768554acf61327fc8352bd5ae313a72d68c4.tar.xz | |
ext4: avoid negative min_clusters in find_group_orlov()
[ Upstream commit bb0a12c3439b10d88412fd3102df5b9a6e3cd6dc ]
min_clusters is signed integer and will be converted to unsigned
integer when compared with unsigned number stats.free_clusters.
If min_clusters is negative, it will be converted to a huge unsigned
value in which case all groups may not meet the actual desired free
clusters.
Set negative min_clusters to 0 to avoid unexpected behavior.
Fixes: ac27a0ec112a ("[PATCH] ext4: initial copy of files from ext3")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://patch.msgid.link/20240820132234.2759926-4-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/ialloc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index d7d89133ed36..1a1e2214c581 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -514,6 +514,8 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent, if (min_inodes < 1) min_inodes = 1; min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; + if (min_clusters < 0) + min_clusters = 0; /* * Start looking in the flex group where we last allocated an |