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Date: Mon, 21 Sep 2015 13:56:45 -0700
Message-ID: <CAH+w=7bZCZV_tBdJ_43udtHDYb7EzJBNcWse8dZ=YA=vOtXYZw@mail.gmail.com>
Subject: Re: Two issues found with -fsanitize=undefined
From: Bart Schaefer <schaefer@brasslantern.com>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Peter Stephenson <p.w.stephenson@ntlworld.com>, Zsh hackers list <zsh-workers@zsh.org>
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On Mon, Sep 21, 2015 at 1:34 PM, Markus Trippelsdorf
<markus@trippelsdorf.de> wrote:
>
>
> Well, only if DEBUG is defined. And as I wrote above the issue doesn't
> happen at all for -DDEBUG.

You mean that even without Peter's latest patch(es), the -fsanitize
checking does not report that a null pointer is being passed in the
case where -DDEBUG is defined?

That must mean (something along the lines of) defining DEBUG is
somehow changing the behavior of malloc(0) so it returns a pointer to
a zero-sized buffer rather than returning a null pointer.