linux-kernel - Re: [PATCH 1/2] drm/i915: fix integer overflow in i915_gem

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Message-ID: <1333719431_271283@CP5-2952>
Date:	Fri, 06 Apr 2012 14:36:40 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Xi Wang <xi.wang@...il.com>, Keith Packard <keithp@...thp.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] drm/i915: fix integer overflow in i915_gem_execbuffer2()

On Fri,  6 Apr 2012 08:58:18 -0400, Xi Wang <xi.wang@...il.com> wrote:
> A large args->buffer_count from userspace may overflow the allocation
> size, leading to out-of-bounds access.
> 
> Use kmalloc_array() to avoid that.

I can safely say that exec list larger than 4GiB is going to be an
illegal operation and would rather the ioctl failed outright with
EINVAL.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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