netdev - Re: [patch] vxge: potential NULL dereference

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Date:	Fri, 10 Sep 2010 14:40:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jon.mason@...r.com
Cc:	error27@...il.com, Ramkrishna.Vepa@...r.com,
	Sivakumar.Subramani@...r.com, Sreenivasa.Honnur@...r.com,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] vxge: potential NULL dereference

From: Jon Mason <jon.mason@...r.com>
Date: Fri, 10 Sep 2010 17:32:15 -0400

> It is possible to the vpath to be NULL in this array if it is not
> populated in __vxge_hw_vp_initialize due to the vpath being masked off
> my the adapter.  vxge_hw_device_begin_irq calls
> __vxge_hw_vpath_alarm_process on all possible vpaths regardless of
> their allocation.  This is the case we need to worry about.
> 
> It is not an issue because in the first instance of the vpath being
> NULL, its sets the alarm_event to be VXGE_HW_EVENT_UNKNOWN.  The first
> check in the out2 error path checks for VXGE_HW_EVENT_UNKNOWN and
> returns.  So its not possible to hit this...though it is ugly code.  I
> welcome a reworking of the code to something mroe elegant. :)

Aha, I see, thanks for explaining this.
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