linux-kernel - Re: [PATCH] intel, gma500, lvds: Fix use after free on psb_intel_lvds

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Message-ID: <alpine.LNX.2.00.1201142156220.11547@swampdragon.chaosbits.net>
Date:	Sat, 14 Jan 2012 21:58:49 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	dri-devel@...ts.freedesktop.org,
	Octavian Purdila <octavian.purdila@...el.com>,
	Dave Airlie <airlied@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>, Eric Anholt <eric@...olt.net>,
	Jesse Barnes <jesse.barnes@...el.com>
Subject: Re: [PATCH] intel, gma500, lvds: Fix use after free on
 psb_intel_lvds_init()

On Sat, 14 Jan 2012, Jesper Juhl wrote:

> In psb_intel_lvds_init(), if we fail to allocate memory for
> 'psb_intel_connector' we free the memory we previously allocated for
> 'psb_intel_encoder', but we then proceed to use that free'd pointer
> when we do 'psb_intel_encoder->dev_priv = lvds_priv;'.
> 
> I believe the proper way to handle this is to simply return after the
> allocation for 'psb_intel_connector' has failed. That is what this
> patch does.
> 

Ok, so I just noticed that we may also leak 'psb_intel_encoder' if we 
'goto failed_connector;'. Might as well fix that as well in the same 
patch.

So please just ignore this one. I'll submit a new one in a little 
while that handles both leaks.

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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