linux-kernel - [PATCH v2 1/2] drm/i915: fix integer overflow in i915_gem

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Message-Id: <1335168402-25174-1-git-send-email-xi.wang@gmail.com>
Date:	Mon, 23 Apr 2012 04:06:41 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, security@...nel.org,
	Xi Wang <xi.wang@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>, stable@...r.kernel.org
Subject: [PATCH v2 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2()

On 32-bit systems, a large args->buffer_count from userspace via ioctl
may overflow the allocation size, leading to out-of-bounds access.

This vulnerability was introduced in commit 8408c282 ("drm/i915:
First try a normal large kmalloc for the temporary exec buffers").

Signed-off-by: Xi Wang <xi.wang@...il.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index f51a696..7c50e58 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1404,7 +1404,8 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
 	struct drm_i915_gem_exec_object2 *exec2_list = NULL;
 	int ret;
 
-	if (args->buffer_count < 1) {
+	if (args->buffer_count < 1 ||
+	    args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
 		DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
 		return -EINVAL;
 	}
-- 
1.7.5.4

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