From: David Ahern dsahern@gmail.com
[ Upstream commit 49d05fe2c9d1b4a27761c9807fec39b8155bef9e ]
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: 93531c674315 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2183,7 +2183,7 @@ static struct dst_entry *rt6_check(struc { 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;