x25: Patch to fix bug 15678 - x25 accesses fields beyond end of packet.

Here is a patch to stop X.25 examining fields beyond the end of the packet.

For example, when a simple CALL ACCEPTED was received:

	10 10 0f

x25_parse_facilities was attempting to decode the FACILITIES field, but this
packet contains no facilities field.
Signed-off-by: John Hughes <john@calva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/x25.h

@@ -182,6 +182,10 @@ extern int  sysctl_x25_clear_request_timeout;
 extern int  sysctl_x25_ack_holdback_timeout;
 extern int  sysctl_x25_forward;
 
+extern int x25_parse_address_block(struct sk_buff *skb,
+		struct x25_address *called_addr,
+		struct x25_address *calling_addr);
+
 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 			  struct x25_address *);
 extern int  x25_addr_aton(unsigned char *, struct x25_address *,

net/x25/af_x25.c

@@ -82,6 +82,41 @@ struct compat_x25_subscrip_struct {
 };
 #endif
 
+
+int x25_parse_address_block(struct sk_buff *skb,
+		struct x25_address *called_addr,
+		struct x25_address *calling_addr)
+{
+	unsigned char len;
+	int needed;
+	int rc;
+
+	if (skb->len < 1) {
+		/* packet has no address block */
+		rc = 0;
+		goto empty;
+	}
+
+	len = *skb->data;
+	needed = 1 + (len >> 4) + (len & 0x0f);
+
+	if (skb->len < needed) {
+		/* packet is too short to hold the addresses it claims
+		   to hold */
+		rc = -1;
+		goto empty;
+	}
+
+	return x25_addr_ntoa(skb->data, called_addr, calling_addr);
+
+empty:
+	*called_addr->x25_addr = 0;
+	*calling_addr->x25_addr = 0;
+
+	return rc;
+}
+
+
 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 		  struct x25_address *calling_addr)
 {
@@ -921,16 +956,26 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 	/*
 	 *	Extract the X.25 addresses and convert them to ASCII strings,
 	 *	and remove them.
+	 *
+	 *	Address block is mandatory in call request packets
 	 */
-	addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
+	addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
+	if (addr_len <= 0)
+		goto out_clear_request;
 	skb_pull(skb, addr_len);
 
 	/*
 	 *	Get the length of the facilities, skip past them for the moment
 	 *	get the call user data because this is needed to determine
 	 *	the correct listener
+	 *
+	 *	Facilities length is mandatory in call request packets
 	 */
+	if (skb->len < 1)
+		goto out_clear_request;
 	len = skb->data[0] + 1;
+	if (skb->len < len)
+		goto out_clear_request;
 	skb_pull(skb,len);
 
 	/*

net/x25/x25_facilities.c

@@ -35,7 +35,7 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
 		struct x25_dte_facilities *dte_facs, unsigned long *vc_fac_mask)
 {
 	unsigned char *p = skb->data;
-	unsigned int len = *p++;
+	unsigned int len;
 
 	*vc_fac_mask = 0;
 
@@ -50,6 +50,14 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
 	memset(dte_facs->called_ae, '\0', sizeof(dte_facs->called_ae));
 	memset(dte_facs->calling_ae, '\0', sizeof(dte_facs->calling_ae));
 
+	if (skb->len < 1)
+		return 0;
+
+	len = *p++;
+
+	if (len >= skb->len)
+		return -1;
+
 	while (len > 0) {
 		switch (*p & X25_FAC_CLASS_MASK) {
 		case X25_FAC_CLASS_A:
@@ -247,6 +255,8 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
 	memcpy(new, ours, sizeof(*new));
 
 	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
+	if (len < 0)
+		return len;
 
 	/*
 	 *	They want reverse charging, we won't accept it.

net/x25/x25_in.c

@@ -89,6 +89,7 @@ static int x25_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
 static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametype)
 {
 	struct x25_address source_addr, dest_addr;
+	int len;
 
 	switch (frametype) {
 		case X25_CALL_ACCEPTED: {
@@ -106,11 +107,17 @@ static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametyp
 			 *	Parse the data in the frame.
 			 */
 			skb_pull(skb, X25_STD_MIN_LEN);
-			skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
-			skb_pull(skb,
-				 x25_parse_facilities(skb, &x25->facilities,
+
+			len = x25_parse_address_block(skb, &source_addr,
+						&dest_addr);
+			if (len > 0)
+				skb_pull(skb, len);
+
+			len = x25_parse_facilities(skb, &x25->facilities,
 						&x25->dte_facilities,
-						&x25->vc_facil_mask));
+						&x25->vc_facil_mask);
+			if (len > 0)
+				skb_pull(skb, len);
 			/*
 			 *	Copy any Call User Data.
 			 */