Q: Given the following code slice:
```
1 int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr,
8 		.daddr = daddr
11 	if (daddr == cpu_to_be32(INADDR_NONE))
13 	rt = ip_route_output_flow(net, &fl4, NULL);
14 	if (IS_ERR(rt))
16 	if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
17 		goto out;```
which has a CWE-476 vulnerability at line:
```
17 		goto out;
```
Please analyze the root cause of the vulnerability.