linux-kernel - Re: [PATCH] net: llc: check for device before dereferencing

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Message-Id: <20140929.164541.20059477388052953.davem@davemloft.net>
Date:	Mon, 29 Sep 2014 16:45:41 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sasha.levin@...cle.com
Cc:	acme@...stprotocols.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: llc: check for device before dereferencing

From: Sasha Levin <sasha.levin@...cle.com>
Date: Fri, 26 Sep 2014 21:41:43 -0400

> llc_ui_sendmsg would not make sure that a device indeed exists before
> dereferencing it. This caused a user triggerable NULL ptr deref:
...
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>

The bug is real, but I don't think the fix is in the correct spot.

The real problem seems to be that the guard for calling
llc_ui_autobind() is inaccurate.

Fix that and there will always be a proper llc->dev attached at
this location.
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