This is a note to let you know that I've just added the patch titled
drm_lease.c: copy user-array safely
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:
drm_lease.c-copy-user-array-safely.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 101ebb5808918b1219a91432a4aa9d9eabefdacb
Author: Philipp Stanner <pstanner@xxxxxxxxxx>
Date: Wed Sep 20 14:36:12 2023 +0200
drm_lease.c: copy user-array safely
[ Upstream commit f37d63e219c39199a59b8b8a211412ff27192830 ]
Currently, there is no overflow-check with memdup_user().
Use the new function memdup_array_user() instead of memdup_user() for
duplicating the user-space array safely.
Suggested-by: David Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-6-pstanner@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index 150fe15550680..94375c6a54256 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -510,8 +510,8 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
/* Handle leased objects, if any */
idr_init(&leases);
if (object_count != 0) {
- object_ids = memdup_user(u64_to_user_ptr(cl->object_ids),
- array_size(object_count, sizeof(__u32)));
+ object_ids = memdup_array_user(u64_to_user_ptr(cl->object_ids),
+ object_count, sizeof(__u32));
if (IS_ERR(object_ids)) {
ret = PTR_ERR(object_ids);
idr_destroy(&leases);
