netdev - Re: [PATCH net] igb: Fix Null-pointer dereference in igb_reset_q

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Message-Id: <20140218.180808.558822435914770314.davem@davemloft.net>
Date:	Tue, 18 Feb 2014 18:08:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	christoph.paasch@...ouvain.be
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	carolyn.wyborny@...el.com
Subject: Re: [PATCH net] igb: Fix Null-pointer dereference in
 igb_reset_q_vector

From: Christoph Paasch <christoph.paasch@...ouvain.be>
Date: Tue, 18 Feb 2014 14:06:57 +0100

> When igb_set_interrupt_capability() calls
> igb_reset_interrupt_capability() (e.g., because CONFIG_PCI_MSI is unset),
> num_q_vectors has been set but no vector has yet been allocated.
> 
> igb_reset_interrupt_capability() will then call igb_reset_q_vector,
> which assumes that the vector is allocated. As this is not the case, we
> are accessing a NULL-pointer.
> 
> This patch fixes it by checking that q_vector is indeed different from
> NULL.
> 
> Fixes: 02ef6e1d0b0023 (igb: Fix queue allocation method to accommodate changing during runtime)
> Cc: Carolyn Wyborny <carolyn.wyborny@...el.com>
> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>

Intel folks, please queue this up, thanks.
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