4.19-stable review patch. If anyone has any objections, please let me know.
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From: Kemeng Shi shikemeng@huaweicloud.com
[ 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 --- fs/ext4/ialloc.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 5dfb34802aed5..39a824df52726 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -510,6 +510,8 @@ 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