linux-kernel - [PATCH AUTOSEL 6.1 10/25] drm_lease.c: copy user-array safely

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Date:   Tue,  7 Nov 2023 07:26:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Philipp Stanner <pstanner@...hat.com>,
        David Airlie <airlied@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Zack Rusin <zackr@...are.com>, Sasha Levin <sashal@...nel.org>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 10/25] drm_lease.c: copy user-array safely

From: Philipp Stanner <pstanner@...hat.com>

[ 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@...hat.com>
Signed-off-by: Philipp Stanner <pstanner@...hat.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Zack Rusin <zackr@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-6-pstanner@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/drm_lease.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index d72c2fac0ff1a..b7362356e5448 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -507,8 +507,8 @@ 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);
-- 
2.42.0