Re: undefined-behavior obstack.c:139

On Wed, Feb 22, 2023 at 09:04:05AM +0000, Alexey Palienko wrote:
> Hi!
> First of all, I would like to thank you for your contribution to the open source!
> 
> I found  some problem with m4 1.4.18. It has been built by clang 13 with "-g -fsanitize=address,undefined -fno-omit-frame-pointer -fsanitize-address-use-after-scope -fno-sanitize-recover=all"
> And we have an error:
> 
> # /home/docker/.conan/data/m4/latest/_/_/package/3421fde5744f1eadef515027cbcbb9a8fbcd667c/bin/m4
> obstack.c:139:35: runtime error: applying non-zero offset 107820858999056 to null pointer
> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior obstack.c:139:35 in
> 
> I think, it is so and for 1.4.19

Bruno Haible supplied a fix for this, which will appear in the
upcoming 1.4.20.


-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org