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

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... and do the same for pread.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
This commit is contained in:
Chris Wilson 2010-09-26 20:21:44 +01:00
parent ce9d419dbe
commit 7dcd2499de
1 changed files with 4 additions and 12 deletions
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16
drivers/gpu/drm/i915/i915_gem.c
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@ -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;
}