ipv6: fix false-postive maybe-uninitialized warning

Adding a lock around one of the assignments prevents gcc from
tracking the state of the local 'fibmatch' variable, so it can no
longer prove that 'dst' is always initialized, leading to a bogus
warning:

net/ipv6/route.c: In function 'inet6_rtm_getroute':
net/ipv6/route.c:3659:2: error: 'dst' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This moves the other assignment into the same lock to shut up the
warning.

Fixes: 121622dba8da ("ipv6: route: make rtm_getroute not assume rtnl is locked")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index dc021ed..bec12ae 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3624,6 +3624,8 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 
                if (!fibmatch)
                        dst = ip6_route_input_lookup(net, dev, &fl6, flags);
+               else
+                       dst = ip6_route_lookup(net, &fl6, 0);
 
                rcu_read_unlock();
        } else {
@@ -3631,10 +3633,10 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 
                if (!fibmatch)
                        dst = ip6_route_output(net, NULL, &fl6);
+               else
+                       dst = ip6_route_lookup(net, &fl6, 0);
        }
 
-       if (fibmatch)
-               dst = ip6_route_lookup(net, &fl6, 0);
 
        rt = container_of(dst, struct rt6_info, dst);
        if (rt->dst.error) {