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mnt_idmapping: Use kmemdup_array instead of kmemdup for multiple allocation

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Let the kememdup_array() take care about multiplication and possible
overflows.

v2:Add a new modification for reverse array.

Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
Link: https://lore.kernel.org/r/20240823015542.3006262-1-yujiaoliang@vivo.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Yu Jiaoliang 2024-08-23 09:55:41 +08:00 committed by Christian Brauner
parent 3c58a9575e
commit 75e4c6bcb8
1 changed files with 6 additions and 6 deletions
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8
fs/mnt_idmapping.c
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@ -228,14 +228,14 @@ static int copy_mnt_idmap(struct uid_gid_map *map_from,
return 0;
}
forward = kmemdup(map_from->forward,
nr_extents * sizeof(struct uid_gid_extent),
forward = kmemdup_array(map_from->forward, nr_extents,
sizeof(struct uid_gid_extent),
GFP_KERNEL_ACCOUNT);
if (!forward)
return -ENOMEM;
reverse = kmemdup(map_from->reverse,
nr_extents * sizeof(struct uid_gid_extent),
reverse = kmemdup_array(map_from->reverse, nr_extents,
sizeof(struct uid_gid_extent),
GFP_KERNEL_ACCOUNT);
if (!reverse) {
kfree(forward);