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| author | Stefan Tomanek <stefan.tomanek@wertarbyte.de> | 2013-12-10 23:21:25 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-12-10 17:54:23 -0500 |
| commit | 673498b8ed4c4d4b7221c5309d891c5eac2b7528 (patch) | |
| tree | b0e29c809ae12246f544fa3c6552af71acd361e7 /net/ipv6/fib6_rules.c | |
| parent | d323e92cc3f4edd943610557c9ea1bb4bb5056e8 (diff) | |
| download | linux-673498b8ed4c4d4b7221c5309d891c5eac2b7528.tar.gz linux-673498b8ed4c4d4b7221c5309d891c5eac2b7528.tar.bz2 linux-673498b8ed4c4d4b7221c5309d891c5eac2b7528.zip | |
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>
Diffstat (limited to 'net/ipv6/fib6_rules.c')
| -rw-r--r-- | net/ipv6/fib6_rules.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c index e27591635f92..3fd0a578329e 100644 --- a/net/ipv6/fib6_rules.c +++ b/net/ipv6/fib6_rules.c @@ -122,7 +122,11 @@ out: static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) { struct rt6_info *rt = (struct rt6_info *) arg->result; - struct net_device *dev = rt->rt6i_idev->dev; + struct net_device *dev = NULL; + + if (rt->rt6i_idev) + dev = rt->rt6i_idev->dev; + /* do not accept result if the route does * not meet the required prefix length */ |