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55 lines
2.0 KiB
Diff
55 lines
2.0 KiB
Diff
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From 673498b8ed4c4d4b7221c5309d891c5eac2b7528 Mon Sep 17 00:00:00 2001
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From: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
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Date: Tue, 10 Dec 2013 23:21:25 +0100
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Subject: [PATCH] inet: fix NULL pointer Oops in fib(6)_rule_suppress
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This changes ensures that the routing entry investigated by the suppress
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function actually does point to a device struct before following that pointer,
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fixing a possible kernel oops situation when verifying the interface group
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associated with a routing table entry.
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According to Daniel Golle, this Oops can be triggered by a user process trying
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to establish an outgoing IPv6 connection while having no real IPv6 connectivity
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set up (only autoassigned link-local addresses).
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Fixes: 6ef94cfafba15 ("fib_rules: add route suppression based on ifgroup")
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Reported-by: Daniel Golle <daniel.golle@gmail.com>
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Tested-by: Daniel Golle <daniel.golle@gmail.com>
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Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv4/fib_rules.c | 5 ++++-
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net/ipv6/fib6_rules.c | 6 +++++-
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2 files changed, 9 insertions(+), 2 deletions(-)
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--- a/net/ipv4/fib_rules.c
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+++ b/net/ipv4/fib_rules.c
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@@ -104,7 +104,10 @@ errout:
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static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
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{
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struct fib_result *result = (struct fib_result *) arg->result;
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- struct net_device *dev = result->fi->fib_dev;
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+ struct net_device *dev = NULL;
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+
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+ if (result->fi)
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+ dev = result->fi->fib_dev;
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/* do not accept result if the route does
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* not meet the required prefix length
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--- a/net/ipv6/fib6_rules.c
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+++ b/net/ipv6/fib6_rules.c
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@@ -122,7 +122,11 @@ out:
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static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
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{
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struct rt6_info *rt = (struct rt6_info *) arg->result;
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- struct net_device *dev = rt->rt6i_idev->dev;
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+ struct net_device *dev = NULL;
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+
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+ if (rt->rt6i_idev)
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+ dev = rt->rt6i_idev->dev;
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+
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/* do not accept result if the route does
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* not meet the required prefix length
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*/
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