linux-kernel - [PATCH 2/2] drm/i915: fix integer overflow in i915_gem_do

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Date:	Fri,  6 Apr 2012 08:58:19 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Keith Packard <keithp@...thp.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, Xi Wang <xi.wang@...il.com>
Subject: [PATCH 2/2] drm/i915: fix integer overflow in i915_gem_do_execbuffer()

A large args->num_cliprects from userspace may overflow the allocation
size, leading to out-of-bounds access.

| i915_gem_do_execbuffer()
| i915_gem_execbuffer()

Use kmalloc_array() to avoid that.

Signed-off-by: Xi Wang <xi.wang@...il.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 19962bd..607be3d 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1133,8 +1133,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 			return -EINVAL;
 		}
 
-		cliprects = kmalloc(args->num_cliprects * sizeof(*cliprects),
-				    GFP_KERNEL);
+		cliprects = kmalloc_array(args->num_cliprects, sizeof(*cliprects),
+					  GFP_KERNEL);
 		if (cliprects == NULL) {
 			ret = -ENOMEM;
 			goto pre_mutex_err;
-- 
1.7.5.4

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