[UBSAN] Call to function (unknown) through pointer to incorrect function type - Githubissues

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[UBSAN] Call to function (unknown) through pointer to incorrect function type #32039

Open llvmbot opened 7 years ago

llvmbot commented 7 years ago


Bugzilla Link	32692
Version	4.0
OS	Linux
Attachments	Source code
Reporter	LLVM Bugzilla Contributor
CC	@efriedma-quic,@pcc

Extended Description

I have a program that dynamically links against a library. The program passes a function pointer to that library, to execute.

But the ubsan (Undefined Behavior Sanitizer) specified that the pointer is on an incorrect function type. And that occurs only

if the callback function has a class as parameter
if the callback function has a class as parameter, but only forward declared
if I specify the compilation flags: -fvisibility=hidden.

I use clang to compile my project.

The attached code is reduced to a simple test case. Check the comments to see where we can act to remove some warnings. But these fixes seem obvious.

llvmbot commented 7 years ago

The issue was previously posted to http://stackoverflow.com/questions/43220926/call-to-function-unknown-through-pointer-to-incorrect-function-type