tcp: fix a potential NULL pointer dereference in tcp_sk_exit

 commit b506bc975f60f06e13e74adb35e708a23dc4e87c upstream.

 When tcp_sk_init() failed in inet_ctl_sock_create(),
 'net->ipv4.tcp_congestion_control' will be left
 uninitialized, but tcp_sk_exit() hasn't check for
 that.

 This patch add checking on 'net->ipv4.tcp_congestion_control'
 in tcp_sk_exit() to prevent NULL-ptr dereference.

Fixes: 6670e152 ("tcp: Namespace-ify sysctl_tcp_default_congestion_control")
Signed-off-by: NDust Li <dust.li@linux.alibaba.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

net/ipv4/tcp_ipv4.c

@@ -2490,6 +2490,7 @@ static void __net_exit tcp_sk_exit(struct net *net)
 {
 	int cpu;
 
+	if (net->ipv4.tcp_congestion_control)
 		module_put(net->ipv4.tcp_congestion_control->owner);
 
 	for_each_possible_cpu(cpu)