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drm/i915: fix integer overflow in i915_gem_do_execbuffer()
authorXi Wang <xi.wang@gmail.com>
Mon, 23 Apr 2012 08:06:42 +0000 (04:06 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 7 May 2012 15:56:34 +0000 (08:56 -0700)
commite469853fcb813790b1d1152122d83a0f2513fc72
treeb8f7a6c412d5d9a8fe3c4e479f141e5200dc8ab7
parentfb247af4ccc4b082dbba85d90a42d31fd48affb2
drm/i915: fix integer overflow in i915_gem_do_execbuffer()

commit 44afb3a04391a74309d16180d1e4f8386fdfa745 upstream.

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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/i915/i915_gem_execbuffer.c