CanBusUtil: Fix crash on listening without arguments

The listening option expects two parameters:
plugin and device.

But it was possible to call the program without
or with only one parameter, which lead to a crash
in util.start(args.at(0), args.at(1), data).

Fix that by always checking the argument size first.

Change-Id: I7c49bfc875f99286e1f04d1d4ef23b7971577363
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/tools/canbusutil/main.cpp b/src/tools/canbusutil/main.cpp
index 1277325..cbb7d7f 100644
--- a/src/tools/canbusutil/main.cpp
+++ b/src/tools/canbusutil/main.cpp
@@ -155,7 +155,9 @@ int main(int argc, char *argv[])
         data = args.at(2);
     } else if (args.size() == 1 && parser.isSet(listDevicesOption)) {
         return util.printDevices(args.at(0));
-    } else if (args.size() != 2) {
+    }
+
+    if (args.size() < 2 || args.size() > 3) {
         output << CanBusUtil::tr("Invalid number of arguments (%1 given).").arg(args.size());
         output << Qt::endl << Qt::endl << parser.helpText();
         return 1;