From: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Date: Tue, 10 Dec 2013 22:21:25 +0000 (+0100)
Subject: inet: fix NULL pointer Oops in fib(6)_rule_suppress
X-Git-Tag: v3.13-rc4~3^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=673498b8ed4c4d4b7221c5309d891c5eac2b7528;p=pandora-kernel.git

inet: fix NULL pointer Oops in fib(6)_rule_suppress

This changes ensures that the routing entry investigated by the suppress
function actually does point to a device struct before following that pointer,
fixing a possible kernel oops situation when verifying the interface group
associated with a routing table entry.

According to Daniel Golle, this Oops can be triggered by a user process trying
to establish an outgoing IPv6 connection while having no real IPv6 connectivity
set up (only autoassigned link-local addresses).

Fixes: 6ef94cfafba15 ("fib_rules: add route suppression based on ifgroup")

Reported-by: Daniel Golle <daniel.golle@gmail.com>
Tested-by: Daniel Golle <daniel.golle@gmail.com>
Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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