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

From: Ursula Braun <redacted>
Date: Mon,  7 Aug 2017 13:28:39 +0200

From: Julian Wiedmann <redacted>

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 <redacted>
Signed-off-by: Ursula Braun <redacted>
Fixes: 87e7597b5a3 qeth: Move away from using neighbour entries in qeth_l3_fill_header()

Applied.