Void codemethod call should not crash #4850
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lzybkr
suggested changes
Sep 17, 2017
| Expression expr = InvokeMethod(codeMethod.CodeReference, null, args.Prepend(target).ToArray(), false, MethodInvocationType.Ordinary); | ||
| if (codeMethod.CodeReference.ReturnType == typeof(void)) | ||
| { | ||
| expr = Expression.Block(expr, Expression.Default(typeof(object))); |
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This should be:
expr = Expression.Block(expr, ExpressionCache.AutomationNullConstant);Otherwise it might be possible to use the return value.
lzybkr
approved these changes
Sep 18, 2017
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Fixes #4826
Adding a check if the method to be called is void, and in that case wrap it in a block that returns null.
Looking at some other code, there seems to be a
CSharpBinderFlags.ResultDiscardedwhen they to this in C#. Can reviewers please check if this or something similar needs to be used here?