diff options
| -rw-r--r-- | target/linux/generic/patches-3.12/065-inet_fix_NULL_pointer.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.12/065-inet_fix_NULL_pointer.patch b/target/linux/generic/patches-3.12/065-inet_fix_NULL_pointer.patch new file mode 100644 index 0000000000..727f8764e7 --- /dev/null +++ b/target/linux/generic/patches-3.12/065-inet_fix_NULL_pointer.patch @@ -0,0 +1,54 @@ +From 673498b8ed4c4d4b7221c5309d891c5eac2b7528 Mon Sep 17 00:00:00 2001 +From: Stefan Tomanek <stefan.tomanek@wertarbyte.de> +Date: Tue, 10 Dec 2013 23:21:25 +0100 +Subject: [PATCH] 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> +--- + net/ipv4/fib_rules.c | 5 ++++- + net/ipv6/fib6_rules.c | 6 +++++- + 2 files changed, 9 insertions(+), 2 deletions(-) + +--- a/net/ipv4/fib_rules.c ++++ b/net/ipv4/fib_rules.c +@@ -104,7 +104,10 @@ errout: + static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) + { + struct fib_result *result = (struct fib_result *) arg->result; +- struct net_device *dev = result->fi->fib_dev; ++ struct net_device *dev = NULL; ++ ++ if (result->fi) ++ dev = result->fi->fib_dev; + + /* do not accept result if the route does + * not meet the required prefix length +--- 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 + */ |