GNU bug report logs - #62009
29.0.60; Emacs crashes on setf symbol-name

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Daniel Mendler <mail <at> daniel-mendler.de>
Cc: philipk <at> posteo.net, michael_heerdegen <at> web.de, rpluim <at> gmail.com, gregory <at> heytings.org, monnier <at> iro.umontreal.ca, 62009 <at> debbugs.gnu.org, arstoffel <at> gmail.com
Subject: bug#62009: 29.0.60; Emacs crashes on setf symbol-name
Date: Fri, 10 Mar 2023 14:13:21 +0200

> Date: Fri, 10 Mar 2023 12:36:17 +0100
> Cc: Gregory Heytings <gregory <at> heytings.org>,
>  Philip Kaludercic <philipk <at> posteo.net>, michael_heerdegen <at> web.de,
>  monnier <at> iro.umontreal.ca, 62009 <at> debbugs.gnu.org, Eli Zaretskii
>  <eliz <at> gnu.org>, Augusto Stoffel <arstoffel <at> gmail.com>
> From: Daniel Mendler <mail <at> daniel-mendler.de>
> 
> >       /* Number of characters in string; MSB is used as the mark bit.  */
> >       ptrdiff_t size;
> >       /* If nonnegative, number of bytes in the string (which is multibyte).
> > 	 If negative, the string is unibyte:
> > 	 -1 for data normally allocated
> > 	 -2 for data in rodata (C string constants)
> > 	 -3 for data that must be immovable (used for bytecode)  */
> >       ptrdiff_t size_byte;
> 
> Thanks! That's good. Given that a read only flag already exists, it is
> easy to fix the issue. We just have to make sure that the size is
> negative for the symbol names and add a check in `aset`.

Let's not do that!

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