net: ipv4: tcp: Fix crash in tcp_nuke_addr

ip_route_output_key can return an ERR_PTR, don't dereference it.

Change-Id: I6b86a451b2bdb33873d79b3cf90c11dbe72bc081
Signed-off-by: Colin Cross <ccross@android.com>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index d1e438f..5eb7af2 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3328,7 +3328,7 @@ static int tcp_is_local(struct net *net, __be32 addr) {
        struct rtable *rt;
        struct flowi4 fl4 = { .daddr = addr };
        rt = ip_route_output_key(net, &fl4);
-       if (!rt)
+       if (IS_ERR_OR_NULL(rt))
                return 0;
        return rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK);
 }