[PATCH] libertas_tf: prevent underflow in process_cmdrequest()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

If recvlength is less than MESSAGE_HEADER_LEN (4) we would end up
corrupting memory.

Fixes: c305a19a0d0a ("libertas_tf: usb specific functions")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
This is from static analysis.  I'm not positive that this is a real
bug, but it's harmless to check.

diff --git a/drivers/net/wireless/marvell/libertas_tf/if_usb.c b/drivers/net/wireless/marvell/libertas_tf/if_usb.c
index e92fc5001171..789337ea676a 100644
--- a/drivers/net/wireless/marvell/libertas_tf/if_usb.c
+++ b/drivers/net/wireless/marvell/libertas_tf/if_usb.c
@@ -605,9 +605,10 @@ static inline void process_cmdrequest(int recvlength, uint8_t *recvbuff,
 {
 	unsigned long flags;
 
-	if (recvlength > LBS_CMD_BUFFER_SIZE) {
+	if (recvlength < MESSAGE_HEADER_LEN ||
+	    recvlength > LBS_CMD_BUFFER_SIZE) {
 		lbtf_deb_usbd(&cardp->udev->dev,
-			     "The receive buffer is too large\n");
+			     "The receive buffer is invalid: %d\n", recvlength);
 		kfree_skb(skb);
 		return;
 	}