From: Xi Wang <xi.wang@gmail.com>
Date: Mon, 23 Apr 2012 08:06:41 +0000 (-0400)
Subject: drm/i915: fix integer overflow in i915_gem_execbuffer2()
X-Git-Tag: v3.2.17~57
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9206caacef21a1eeee7083d8fb188cfeb15fd52;p=pandora-kernel.git

drm/i915: fix integer overflow in i915_gem_execbuffer2()

commit ed8cd3b2cd61004cab85380c52b1817aca1ca49b upstream.

On 32-bit systems, a large args->buffer_count from userspace via ioctl
may overflow the allocation size, leading to out-of-bounds access.

This vulnerability was introduced in commit 8408c282 ("drm/i915:
First try a normal large kmalloc for the temporary exec buffers").

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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