PPPinterface: address getters check for invalid pointer

Author: michalpasztamobica

features/netsocket/PPPInterface.cpp

@@ -94,7 +94,7 @@ const char *PPPInterface::get_ip_address()
 
 nsapi_error_t PPPInterface::get_ip_address(SocketAddress *address)
 {
-    if (address) {
+    if (!address) {
         return NSAPI_ERROR_PARAMETER;
     }
 
@@ -108,6 +108,10 @@ nsapi_error_t PPPInterface::get_ip_address(SocketAddress *address)
 
 nsapi_error_t PPPInterface::get_netmask(SocketAddress *address)
 {
+    if (!address) {
+        return NSAPI_ERROR_PARAMETER;
+    }
+
     if (_interface && _interface->get_netmask(address) == NSAPI_ERROR_OK) {
         strncpy(_netmask, address->get_ip_address(), sizeof(_netmask));
         return NSAPI_ERROR_OK;
@@ -118,6 +122,10 @@ nsapi_error_t PPPInterface::get_netmask(SocketAddress *address)
 
 nsapi_error_t PPPInterface::get_gateway(SocketAddress *address)
 {
+    if (!address) {
+        return NSAPI_ERROR_PARAMETER;
+    }
+
     if (_interface && _interface->get_gateway(address) == NSAPI_ERROR_OK) {
         strncpy(_gateway, address->get_ip_address(), sizeof(_gateway));
         address->set_ip_address(_gateway);