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

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Message-ID: <1333741246_275838@CP5-2952>
Date:	Fri, 06 Apr 2012 20:40:12 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Xi Wang <xi.wang@...il.com>
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 Fri, 6 Apr 2012 14:17:41 -0400, Xi Wang <xi.wang@...il.com> wrote:
> 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.

It's an invalid value for the ioctl and should be treated as such, not
making ENOMEM more ambiguous.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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