[4/8] can: add limit for nframes and clean up signed/unsigned variables

[Greg KH <gregkh@suse.de>]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 4619
Lines: 144

From: Oliver Hartkopp <socketcan@hartkopp.net>

commit 5b75c4973ce779520b9d1e392483207d6f842cde upstream.

This patch adds a limit for nframes as the number of frames in TX_SETUP and
RX_SETUP are derived from a single byte multiplex value by default.
Use-cases that would require to send/filter more than 256 CAN frames should
be implemented in userspace for complexity reasons anyway.

Additionally the assignments of unsigned values from userspace to signed
values in kernelspace and vice versa are fixed by using unsigned values in
kernelspace consistently.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Reported-by: Ben Hawkes <hawkes@google.com>
Acked-by: Urs Thuermann <urs.thuermann@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/can/bcm.c |   38 +++++++++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 13 deletions(-)

--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -58,6 +58,13 @@
 #include <net/sock.h>
 #include <net/net_namespace.h>
 
+/*
+ * To send multiple CAN frame content within TX_SETUP or to filter
+ * CAN messages with multiplex index within RX_SETUP, the number of
+ * different filters is limited to 256 due to the one byte index value.
+ */
+#define MAX_NFRAMES 256
+
 /* use of last_frames[index].can_dlc */
 #define RX_RECV    0x40 /* received data for this element */
 #define RX_THR     0x80 /* element not been sent due to throttle feature */
@@ -86,15 +93,15 @@ struct bcm_op {
 	struct list_head list;
 	int ifindex;
 	canid_t can_id;
-	int flags;
+	u32 flags;
 	unsigned long frames_abs, frames_filtered;
 	struct timeval ival1, ival2;
 	struct hrtimer timer, thrtimer;
 	ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
 	int rx_ifindex;
-	int count;
-	int nframes;
-	int currframe;
+	u32 count;
+	u32 nframes;
+	u32 currframe;
 	struct can_frame *frames;
 	struct can_frame *last_frames;
 	struct can_frame sframe;
@@ -173,7 +180,7 @@ static int bcm_read_proc(char *page, cha
 		len += snprintf(page + len, PAGE_SIZE - len,
 				"rx_op: %03X %-5s ",
 				op->can_id, bcm_proc_getifname(op->ifindex));
-		len += snprintf(page + len, PAGE_SIZE - len, "[%d]%c ",
+		len += snprintf(page + len, PAGE_SIZE - len, "[%u]%c ",
 				op->nframes,
 				(op->flags & RX_CHECK_DLC)?'d':' ');
 		if (op->kt_ival1.tv64)
@@ -207,7 +214,7 @@ static int bcm_read_proc(char *page, cha
 	list_for_each_entry(op, &bo->tx_ops, list) {
 
 		len += snprintf(page + len, PAGE_SIZE - len,
-				"tx_op: %03X %s [%d] ",
+				"tx_op: %03X %s [%u] ",
 				op->can_id, bcm_proc_getifname(op->ifindex),
 				op->nframes);
 
@@ -288,7 +295,7 @@ static void bcm_send_to_user(struct bcm_
 	struct can_frame *firstframe;
 	struct sockaddr_can *addr;
 	struct sock *sk = op->sk;
-	int datalen = head->nframes * CFSIZ;
+	unsigned int datalen = head->nframes * CFSIZ;
 	int err;
 
 	skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
@@ -466,7 +473,7 @@ static void bcm_rx_update_and_send(struc
  * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
  *                       received data stored in op->last_frames[]
  */
-static void bcm_rx_cmp_to_index(struct bcm_op *op, int index,
+static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
 				struct can_frame *rxdata)
 {
 	/*
@@ -548,7 +555,7 @@ static int bcm_rx_thr_flush(struct bcm_o
 	int updated = 0;
 
 	if (op->nframes > 1) {
-		int i;
+		unsigned int i;
 
 		/* for MUX filter we start at index 1 */
 		for (i = 1; i < op->nframes; i++) {
@@ -597,7 +604,7 @@ static void bcm_rx_handler(struct sk_buf
 {
 	struct bcm_op *op = (struct bcm_op *)data;
 	struct can_frame rxframe;
-	int i;
+	unsigned int i;
 
 	/* disable timeout */
 	hrtimer_cancel(&op->timer);
@@ -799,14 +806,15 @@ static int bcm_tx_setup(struct bcm_msg_h
 {
 	struct bcm_sock *bo = bcm_sk(sk);
 	struct bcm_op *op;
-	int i, err;
+	unsigned int i;
+	int err;
 
 	/* we need a real device to send frames */
 	if (!ifindex)
 		return -ENODEV;
 
-	/* we need at least one can_frame */
-	if (msg_head->nframes < 1)
+	/* check nframes boundaries - we need at least one can_frame */
+	if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
 		return -EINVAL;
 
 	/* check the given can_id */
@@ -966,6 +974,10 @@ static int bcm_rx_setup(struct bcm_msg_h
 		msg_head->nframes = 0;
 	}
 
+	/* the first element contains the mux-mask => MAX_NFRAMES + 1  */
+	if (msg_head->nframes > MAX_NFRAMES + 1)
+		return -EINVAL;
+
 	if ((msg_head->flags & RX_RTR_FRAME) &&
 	    ((msg_head->nframes != 1) ||
 	     (!(msg_head->can_id & CAN_RTR_FLAG))))