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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-09-26 20:21:44 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-10-03 14:16:18 +0100 |
| commit | 7dcd2499deab8f10011713c40bc2f309c9b65077 (patch) | |
| tree | 1fc0476339e3fabd6b2a5f62dba1fd10abfd82f8 /drivers/gpu | |
| parent | ce9d419dbecc292cc3e06e8b1d6d123d3fa813a4 (diff) | |
| download | linux-7dcd2499deab8f10011713c40bc2f309c9b65077.tar.gz linux-7dcd2499deab8f10011713c40bc2f309c9b65077.tar.bz2 linux-7dcd2499deab8f10011713c40bc2f309c9b65077.zip | |
drm/i915: Rephrase pwrite bounds checking to avoid any potential overflow
... and do the same for pread.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 7749e78a7300..aa959c4a1836 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -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; } |