[TCP]: 'dst' can be NULL in tcp_rto_min()

Reported by Rick Jones.

Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/tcp_input.c

···
 	struct dst_entry *dst = __sk_dst_get(sk);
 	u32 rto_min = TCP_RTO_MIN;
 
-	if (dst_metric_locked(dst, RTAX_RTO_MIN))
+	if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
 		rto_min = dst->metrics[RTAX_RTO_MIN-1];
 	return rto_min;
 }