linux-kernel - [14/25] drm/i915: Rephrase pwrite bounds checking to avoid any potential overflow

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Date:	Tue, 22 Nov 2011 16:21:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable@...r.kernel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Greg Kroah-Hartman <greg@...ah.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: [14/25] drm/i915: Rephrase pwrite bounds checking to avoid any potential overflow

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1407
Lines: 47

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 7dcd2499deab8f10011713c40bc2f309c9b65077 upstream

... and do the same for pread.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/i915_gem.c |   16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -482,12 +482,8 @@ i915_gem_pread_ioctl(struct drm_device *
 		return -EBADF;
 	obj_priv = obj->driver_private;
 
-	/* Bounds check source.
-	 *
-	 * XXX: This could use review for overflow issues...
-	 */
-	if (args->offset > obj->size || args->size > obj->size ||
-	    args->offset + args->size > obj->size) {
+	/* Bounds check source.  */
+	if (args->offset > obj->size || args->size > obj->size - args->offset) {
 		ret = -EINVAL;
 		goto err;
 	}
@@ -960,12 +956,8 @@ i915_gem_pwrite_ioctl(struct drm_device
 		return -EBADF;
 	obj_priv = obj->driver_private;
 
-	/* Bounds check destination.
-	 *
-	 * XXX: This could use review for overflow issues...
-	 */
-	if (args->offset > obj->size || args->size > obj->size ||
-	    args->offset + args->size > obj->size) {
+	/* Bounds check destination. */
+	if (args->offset > obj->size || args->size > obj->size - args->offset) {
 		ret = -EINVAL;
 		goto err;
 	}


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