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| author | Xi Wang <xi.wang@gmail.com> | 2012-04-23 04:06:42 -0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-04-23 22:32:15 +0200 |
| commit | 44afb3a04391a74309d16180d1e4f8386fdfa745 (patch) | |
| tree | feec2dbbdc8a76932bd10289a3532a4b29c6ef6a | |
| parent | ed8cd3b2cd61004cab85380c52b1817aca1ca49b (diff) | |
| download | overlayfs-44afb3a04391a74309d16180d1e4f8386fdfa745.tar.gz | |
drm/i915: fix integer overflow in i915_gem_do_execbuffer()
On 32-bit systems, a large args->num_cliprects from userspace via ioctl
may overflow the allocation size, leading to out-of-bounds access.
This vulnerability was introduced in commit 432e58ed ("drm/i915: Avoid
allocation for execbuffer object list").
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_execbuffer.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 7c50e58175c027..de431942ded4bb 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1133,6 +1133,11 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, return -EINVAL; } + if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) { + DRM_DEBUG("execbuf with %u cliprects\n", + args->num_cliprects); + return -EINVAL; + } cliprects = kmalloc(args->num_cliprects * sizeof(*cliprects), GFP_KERNEL); if (cliprects == NULL) { |