diff --git a/include/net/sock.h b/include/net/sock.h
index 5a0a58ac4126..317bdcb7cc8c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -327,6 +327,7 @@ struct sock {
 				sk_no_check  : 2,
 				sk_userlocks : 4,
 				sk_protocol  : 8,
+#define SK_PROTOCOL_MAX U8_MAX
 				sk_type      : 16;
 	kmemcheck_bitfield_end(flags);
 	int			sk_wmem_queued;
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 9d9a6a3edbd5..6ab35a29ed26 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -811,6 +811,9 @@ static int ax25_create(struct net *net, struct socket *sock, int protocol,
 	struct sock *sk;
 	ax25_cb *ax25;
 
+	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
+		return -EINVAL;
+
 	if (!net_eq(net, &init_net))
 		return -EAFNOSUPPORT;
 
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 4136987d94da..4fa941ea4d64 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -680,6 +680,9 @@ static int dn_create(struct net *net, struct socket *sock, int protocol,
 {
 	struct sock *sk;
 
+	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
+		return -EINVAL;
+
 	if (!net_eq(net, &init_net))
 		return -EAFNOSUPPORT;
 
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 690948330d5e..9b731c030b6e 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -297,6 +297,9 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
 	int try_loading_module = 0;
 	int err;
 
+	if (protocol < 0 || protocol >= IPPROTO_MAX)
+		return -EINVAL;
+
 	if (!current_has_network())
 		return -EACCES;
 
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 69b587e3a5cb..b7ed0abd6ea7 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -123,6 +123,9 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
 	int try_loading_module = 0;
 	int err;
 
+	if (protocol < 0 || protocol >= IPPROTO_MAX)
+		return -EINVAL;
+
 	if (!current_has_network())
 		return -EACCES;
 
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index bb14c3477680..f1ef79cadd52 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -1104,6 +1104,9 @@ static int irda_create(struct net *net, struct socket *sock, int protocol,
 	struct sock *sk;
 	struct irda_sock *self;
 
+	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
+		return -EINVAL;
+
 	IRDA_DEBUG(2, "%s()\n", __func__);
 
 	if (net != &init_net)