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ipv6: Fix __ip6_route_redirect

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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>
This commit is contained in:
Martin KaFai Lau 2015-01-20 19:16:02 -08:00 committed by David S. Miller
parent 24df8986f3
commit b0a1ba5992
1 changed files with 5 additions and 1 deletions
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6
net/ipv6/route.c
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@ -1242,12 +1242,16 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
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);