Crash on small (2x2) window sizes

Crash on small (2x2) window sizes

[Tom McLaughlin]

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Hello,

I found a crash that happens why you try to run a very small (2x2) window
with ZSH.

I made a repro with a full description which you can find here:
https://github.com/thomasjm/zsh-bug-demo

Please let me know if there's any other information I can provide.

Thanks,
Tom

Re: Crash on small (2x2) window sizes

[Bart Schaefer]

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I can't find the reference but I'm fairly sure this was fixed a while
back.  I see you are testing with Zsh 5.5.1.

I can't easily confirm just now - MacOS won't allow me to create a window
that small - but please try again with Zsh 5.7.1 or thereabouts?

Re: Crash on small (2x2) window sizes

[Tom McLaughlin]

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Hi Bart -- I first noticed the problem on 5.7.1 actually. If you switch to
Ubuntu 19.10 in my repro Dockerfile then you can try that version. The
problem still exists. Interestingly, it seems like you have to type 4
characters before it crashes on 5.7.1 as opposed to 2 characters in 5.5.1.

Here's the output from my repro script:

```
ZSH version:  zsh 5.7.1 (x86_64-ubuntu-linux-gnu)

asdf
free(): invalid next size (fast)
```



On Wed, Jun 26, 2019 at 10:17 AM Bart Schaefer <schaefer@brasslantern.com>
wrote:

> I can't find the reference but I'm fairly sure this was fixed a while
> back.  I see you are testing with Zsh 5.5.1.
>
> I can't easily confirm just now - MacOS won't allow me to create a window
> that small - but please try again with Zsh 5.7.1 or thereabouts?
>