1 files changed, 26 insertions, 30 deletions

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index defeb7a0d502..9d211f12582b 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -33,9 +33,30 @@
 #include <net/phonet/phonet.h>
 #include <net/phonet/pn_dev.h>
 
-static struct net_proto_family phonet_proto_family;
-static struct phonet_protocol *phonet_proto_get(int protocol);
-static inline void phonet_proto_put(struct phonet_protocol *pp);
+/* Transport protocol registration */
+static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
+static DEFINE_SPINLOCK(proto_tab_lock);
+
+static struct phonet_protocol *phonet_proto_get(int protocol)
+{
+        struct phonet_protocol *pp;
+
+        if (protocol >= PHONET_NPROTO)
+                return NULL;
+
+        spin_lock(&proto_tab_lock);
+        pp = proto_tab[protocol];
+        if (pp && !try_module_get(pp->prot->owner))
+                pp = NULL;
+        spin_unlock(&proto_tab_lock);
+
+        return pp;
+}
+
+static inline void phonet_proto_put(struct phonet_protocol *pp)
+{
+        module_put(pp->prot->owner);
+}
 
 /* protocol family functions */
 
@@ -144,8 +165,8 @@ static int pn_send(struct sk_buff *skb, struct net_device *dev,
         struct phonethdr *ph;
         int err;
 
-        if (skb->len + 2 > 0xffff) {
-                /* Phonet length field would overflow */
+        if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
+            skb->len + sizeof(struct phonethdr) > dev->mtu) {
                 err = -EMSGSIZE;
                 goto drop;
         }
@@ -375,10 +396,6 @@ static struct packet_type phonet_packet_type = {
         .func = phonet_rcv,
 };
 
-/* Transport protocol registration */
-static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
-static DEFINE_SPINLOCK(proto_tab_lock);
-
 int __init_or_module phonet_proto_register(int protocol,
                                                 struct phonet_protocol *pp)
 {
@@ -412,27 +429,6 @@ void phonet_proto_unregister(int protocol, struct phonet_protocol *pp)
 }
 EXPORT_SYMBOL(phonet_proto_unregister);
 
-static struct phonet_protocol *phonet_proto_get(int protocol)
-{
-        struct phonet_protocol *pp;
-
-        if (protocol >= PHONET_NPROTO)
-                return NULL;
-
-        spin_lock(&proto_tab_lock);
-        pp = proto_tab[protocol];
-        if (pp && !try_module_get(pp->prot->owner))
-                pp = NULL;
-        spin_unlock(&proto_tab_lock);
-
-        return pp;
-}
-
-static inline void phonet_proto_put(struct phonet_protocol *pp)
-{
-        module_put(pp->prot->owner);
-}
-
 /* Module registration */
 static int __init phonet_init(void)
 {