Re: Auto-indent and undo causes crashes

[Benno Schulenberg]

Hello Liu,

Op 02-04-2020 om 19:04 schreef Liu Hao:
> It looks like 1961c052c85394d1dfb5d2d98d31f154757c8d08 introduced a bug
> that causes nano to crash, as follows:
> 
> 0) Run `nano -Ii`.
> 1) Type `      a`. Leading spaces are intentional.
> 2) Press <Left>. This places the cursor just preceding `a`.
> 3) Press <Enter>. This inserts a blank line before it.
> 4) Press M-U. This is expected to undo the insertion, but please
>    note that leading spaces are gone now.
> 5) Press M-U once more. This causes nano to crash. Error messages
>    vary from SIGSEGV, SIGBUS to 'Nano is out of memory!'.

Thanks for reporting!

Indeed, that commit was a mistake.  :/

I've re-reported the bug as https://savannah.gnu.org/bugs/?58108.

And it is fixed in git:

  https://git.savannah.gnu.org/cgit/nano.git/commit/?id=9a67d795


Out of curiosity, did you run into this while using nano?  Or did
you find it by looking at the code or commits?

Benno

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