linux-kernel - Re: [PATCH] drm/i915: fix possible null pointer dereference

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Message-ID: <20150720123846.GA6166@nuc-i3427.alporthouse.com>
Date:	Mon, 20 Jul 2015 13:38:46 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: fix possible null pointer dereference

On Mon, Jul 20, 2015 at 05:59:29PM +0530, Sudip Mukherjee wrote:
> We were dereferencing dev first and then checking if it is NULL. Lets
> check for NULL first and then dereference.

The code is bonkers. Testing for a lack of a correctly constructed
debugfs seq_file inside the debugfs seq_file callback is inane.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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