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Commit 7dcd2499 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Rephrase pwrite bounds checking to avoid any potential overflow 



... and do the same for pread.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
parent ce9d419d

drivers/gpu/drm/i915/i915_gem.c

+4 −12
Original line number Diff line number Diff line
@@ -471,12 +471,8 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data, 
		return -ENOENT;

	obj_priv = to_intel_bo(obj);



	/* 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;

	}
@@ -939,12 +935,8 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, 
		return -ENOENT;

	obj_priv = to_intel_bo(obj);



	/* 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;

	}