netdev - Re: [PATCH net 1/1] s390/qeth: fix L3 next-hop in xmit qeth hdr

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Date:   Mon, 07 Aug 2017 11:25:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ubraun@...ux.vnet.ibm.com
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        jwi@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, raspl@...ux.vnet.ibm.com
Subject: Re: [PATCH net 1/1] s390/qeth: fix L3 next-hop in xmit qeth hdr

From: Ursula Braun <ubraun@...ux.vnet.ibm.com>
Date: Mon,  7 Aug 2017 13:28:39 +0200

> From: Julian Wiedmann <jwi@...ux.vnet.ibm.com>
> 
> On L3, the qeth_hdr struct needs to be filled with the next-hop
> IP address.
> The current code accesses rtable->rt_gateway without checking that
> rtable is a valid address. The accidental access to a lowcore area
> results in a random next-hop address in the qeth_hdr.
> rtable (or more precisely, skb_dst(skb)) can be NULL in rare cases
> (for instance together with AF_PACKET sockets).
> This patch adds the missing NULL-ptr checks.
> 
> Signed-off-by: Julian Wiedmann <jwi@...ux.vnet.ibm.com>
> Signed-off-by: Ursula Braun <ubraun@...ux.vnet.ibm.com>
> Fixes: 87e7597b5a3 qeth: Move away from using neighbour entries in qeth_l3_fill_header()

Applied.