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Message-ID: <34e14523c9cea13e2f63afabf2938c89d2e84776.1693386602.git.pstanner@redhat.com>
Date: Wed, 30 Aug 2023 15:45:55 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Kees Cook <keescook@...omium.org>,
Andy Shevchenko <andy@...nel.org>,
Eric Biederman <ebiederm@...ssion.com>,
Christian Brauner <brauner@...nel.org>,
David Disseldorp <ddiss@...e.de>,
Luis Chamberlain <mcgrof@...nel.org>,
Siddh Raman Pant <code@...dh.me>,
Nick Alcock <nick.alcock@...cle.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Zack Rusin <zackr@...are.com>
Cc: VMware Graphics Reviewers <linux-graphics-maintainer@...are.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kexec@...ts.infradead.org, linux-hardening@...r.kernel.org,
Philipp Stanner <pstanner@...hat.com>,
David Airlie <airlied@...hat.com>
Subject: [PATCH 4/5] drm_lease.c: copy user-array safely
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>
---
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 150fe1555068..94375c6a5425 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);
--
2.41.0
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