This is a note to let you know that I've just added the patch titled
ext4: remove unnecessary check from alloc_flex_gd()
to the 6.6-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-remove-unnecessary-check-from-alloc_flex_gd.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cdd7e214c602bf6f2347631de2b0ac010ae93f77
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Mon Oct 23 09:30:55 2023 +0800
ext4: remove unnecessary check from alloc_flex_gd()
[ Upstream commit b099eb87de105cf07cad731ded6fb40b2675108b ]
In commit 967ac8af4475 ("ext4: fix potential integer overflow in
alloc_flex_gd()"), an overflow check is added to alloc_flex_gd() to
prevent the allocated memory from being smaller than expected due to
the overflow. However, after kmalloc() is replaced with kmalloc_array()
in commit 6da2ec56059c ("treewide: kmalloc() -> kmalloc_array()"), the
kmalloc_array() function has an overflow check, so the above problem
will not occur. Therefore, the extra check is removed.
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20231023013057.2117948-3-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index f3a9b97bb7e7..df47b269efce 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -249,10 +249,7 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned int flexbg_size)
if (flex_gd == NULL)
goto out3;
- if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
- goto out2;
flex_gd->count = flexbg_size;
-
flex_gd->groups = kmalloc_array(flexbg_size,
sizeof(struct ext4_new_group_data),
GFP_NOFS);
