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

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Message-Id: <507CC69B-BD9C-421B-9107-B3284BEB116E@gmail.com>
Date:	Fri, 6 Apr 2012 14:17:41 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Keith Packard <keithp@...thp.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	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 Apr 6, 2012, at 10:44 AM, Chris Wilson wrote:

> That I agreed with, I just disagree with how you chose to handle it.
> Rather than continue on and attempt to vmalloc a large array we should
> just fail the ioctl with EINVAL.

Why an attempt to vmalloc?  The overflow check in drm_malloc_ab()
will simply return NULL and fail the ioctl with -ENOMEM.

- xi

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