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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: 121622dba8 ("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>
This commit is contained in:
Arnd Bergmann 2017-08-18 13:34:22 +02:00 committed by David S. Miller
parent 66ff5fa08b
commit 401481e060
1 changed files with 4 additions and 2 deletions
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6
net/ipv6/route.c
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@ -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) {