[PATCH net] ipv6: Fix unbalanced rcu locking in rt6_update_exception_stamp_rt

[David Ahern]

From: David Ahern <dsah...@gmail.com>

The nexthop path in rt6_update_exception_stamp_rt needs to call
rcu_read_unlock if it fails to find a fib6_nh match rather than
just returning.

Fixes: e659ba31d806 ("ipv6: Handle all fib6_nh in a nexthop in exception 
handling")
Signed-off-by: David Ahern <dsah...@gmail.com>
---
 net/ipv6/route.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e49fec767a10..fd059e08785a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1951,7 +1951,7 @@ static void rt6_update_exception_stamp_rt(struct rt6_info 
*rt)
                nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
 
                if (!arg.match)
-                       return;
+                       goto unlock;
                fib6_nh = arg.match;
        } else {
                fib6_nh = from->fib6_nh;
-- 
2.11.0