Add safeguard for -of option

Author: pblottiere

python/plugins/processing/algs/gdal/warp.py

@@ -226,8 +226,13 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
 
         out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
         self.setOutputValue(self.OUTPUT, out)
+
+        output_format = QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1])
+        if not output_format:
+            raise QgsProcessingException(self.tr('Output format is invalid'))
+
         arguments.append('-of')
-        arguments.append(QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]))
+        arguments.append(output_format)
 
         options = self.parameterAsString(parameters, self.OPTIONS, context)
         if options: