Commit 49d05fe2 authored Jul 17, 2019 by David Ahern Committed by David S. Miller Jul 17, 2019

ipv6: rt6_check should return NULL if 'from' is NULL



Paul reported that l2tp sessions were broken after the commit referenced
in the Fixes tag. Prior to this commit rt6_check returned NULL if the
rt6_info 'from' was NULL - ie., the dst_entry was disconnected from a FIB
entry. Restore that behavior.

Fixes: 93531c67 ("net/ipv6: separate handling of FIB entries from dst based routes")
Reported-by: Paul Donohue <linux-kernel@PaulSD.com>
Tested-by: Paul Donohue <linux-kernel@PaulSD.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 866e5fd8

net/ipv6/route.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2563,7 +2563,7 @@ static struct dst_entry rt6_check(struct rt6_info rt,
		{
		u32 rt_cookie = 0;

		if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) \|\|
		if (!from \|\| !fib6_get_cookie_safe(from, &rt_cookie) \|\|
		rt_cookie != cookie)
		return NULL;