ipv6: Fix __ip6_route_redirect

In my last commit (a3c00e4: ipv6: Remove BACKTRACK macro), the changes in
__ip6_route_redirect is incorrect.  The following case is missed:
1. The for loop tries to find a valid gateway rt. If it fails to find
   one, rt will be NULL.
2. When rt is NULL, it is set to the ip6_null_entry.
3. The newly added 'else if', from a3c00e4, will stop the backtrack from
   happening.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 166e33b..4959653 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1242,12 +1242,16 @@ restart:
                rt = net->ipv6.ip6_null_entry;
        else if (rt->dst.error) {
                rt = net->ipv6.ip6_null_entry;
-       } else if (rt == net->ipv6.ip6_null_entry) {
+               goto out;
+       }
+
+       if (rt == net->ipv6.ip6_null_entry) {
                fn = fib6_backtrack(fn, &fl6->saddr);
                if (fn)
                        goto restart;
        }
 
+out:
        dst_hold(&rt->dst);
 
        read_unlock_bh(&table->tb6_lock);