Added baudrate validation functions to the Serial implementations

platforms/posix/src/px4/common/SerialImpl.cpp

@@ -36,11 +36,32 @@ SerialImpl::~SerialImpl()
 	}
 }
 
+bool SerialImpl::validateBaudrate(uint32_t baudrate)
+{
+	if ((baudrate == 9600) ||
+		(baudrate == 19200) ||
+		(baudrate == 38400) ||
+		(baudrate == 57600) ||
+		(baudrate == 115200) ||
+		(baudrate == 230400) ||
+		(baudrate == 460800) ||
+		(baudrate == 921600)) {
+		return true;
+	}
+
+	return false;
+}
+
 bool SerialImpl::configure()
 {
 	/* process baud rate */
 	int speed;
 
+	if (! validateBaudrate(_baudrate)) {
+		PX4_ERR("ERR: unknown baudrate: %u", _baudrate);
+		return false;
+	}
+
 	switch (_baudrate) {
 	case 9600:   speed = B9600;   break;
 
@@ -295,6 +316,11 @@ uint32_t SerialImpl::getBaudrate() const
 
 bool SerialImpl::setBaudrate(uint32_t baudrate)
 {
+	if (! validateBaudrate(baudrate)) {
+		PX4_ERR("ERR: invalid baudrate: %u", baudrate);
+		return false;
+	}
+
 	// check if already configured
 	if ((baudrate == _baudrate) && _open) {
 		return true;