bug#40913: 24.5; Crash on open of file

[Jason Gibson]

>> From: Jason Gibson <jgibson@perforce.com>
>> Date: Mon, 27 Apr 2020 14:31:15 -0700
>>
>> Attached is a file that crashes Emacs on find-file (find-file-literally
>> does not crash).  E.g.:
>>
>>   tar xf foo8.tar
>>   LC_CTYPE=en_US.UTF-8 emacs -Q -nw --eval '(find-file "foo8")'
>>   *poof*
>
> Thanks.  This is a very old bug, now fixed on the emacs-27 branch.  If
> you can build that branch, please see that the crash is gone now.

The change works for me as well.

Since this would seem to be a good vector for remote buffer overflow, it
might make sense to backport this to prior releases.

Thanks for the quick fix.

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