[PATCH][IPV6]: Make sure fib6_rule_lookup doesn't return NULL

[Ville Nuorvala <vnuorval@tcs.hut.fi>]

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Hi David,

please apply the attached patch!

Regards,
Ville

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commit 1fb9864632af5a493353643e7acf970da1d4f59f
tree 569fd122cad5000077f80138a3014c390a7999f5
parent a66c990b9f6b0b9b4c4d2b84f96ddd019b7a8eb3
author Ville Nuorvala <vnuorval@tcs.hut.fi> 1155073548 +0300
committer Ville Nuorvala <vnuorval@tcs.hut.fi> 1155073548 +0300

    [IPV6]: Make sure fib6_rule_lookup doesn't return NULL
    
    The callers of fib6_rule_lookup don't expect it to return NULL,
    therefore it must return ip6_null_entry whenever fib_rule_lookup fails.
    
    Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi>

diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index bf9bba8..22a2fdb 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -63,7 +63,11 @@ struct dst_entry *fib6_rule_lookup(struc
 	if (arg.rule)
 		fib_rule_put(arg.rule);
 
-	return (struct dst_entry *) arg.result;
+	if (arg.result)
+		return (struct dst_entry *) arg.result;
+
+	dst_hold(&ip6_null_entry.u.dst);
+	return &ip6_null_entry.u.dst;
 }
 
 static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,