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

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Date:	Tue, 18 Feb 2014 23:57:32 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	"christoph.paasch@...ouvain.be" <christoph.paasch@...ouvain.be>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH net] igb: Fix Null-pointer dereference in
 igb_reset_q_vector

On Tue, 2014-02-18 at 14:06 +0100, Christoph Paasch wrote:
> 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>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Thanks Christoph, I have added this to our Jeff's internal queue.