This is a note to let you know that I've just added the patch titled
ext4: avoid negative min_clusters in find_group_orlov()
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-negative-min_clusters-in-find_group_orlov.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 4ac2313d98954997eb467a6f946c02289aca3ad0
Author: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Date: Tue Aug 20 21:22:30 2024 +0800
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@xxxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240820132234.2759926-4-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 99e8852c4e1dd..8a8d802275608 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
