netdev - Re: [PATCH] (resend) ixgbe: always initialize setup

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Date:	Wed, 6 Jul 2016 23:00:51 +0000
From:	"Rustad, Mark D" <mark.d.rustad@...el.com>
To:	Patrick McLean <patrickm@...kai.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] (resend) ixgbe: always initialize setup_fc

Patrick McLean <patrickm@...kai.com> wrote:

> Gmail mangled my first message, sorry about that. Second attempt.
>
> In ixgbe_init_mac_link_ops_X550em, the code has a special case for
> backplane media type, but does not fall through to the default case,
> so the setup_fc never gets initialized. This causes a panic when it
> later tries to set up the card, and the kernel dereferences the null
> pointer.
>
> This patch lets the the function fall through, which initialized
> setup_fc properly.

I don't think that this is the right fix. My memory is that fc autoneg is  
not supported in that configuration, so setup_fc is intended to be NULL. I  
think it is the reference that needs to have a check added.

--
Mark Rustad, Networking Division, Intel Corporation

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