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bug#41232: [PATCH] Avoid a segfault when processing disable-eval specs


From: Clément Pit-Claudel
Subject: bug#41232: [PATCH] Avoid a segfault when processing disable-eval specs
Date: Wed, 13 May 2020 10:40:18 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0

The following code causes Emacs to segfault:

  (insert (propertize "A" 'display '(disable-eval . nil)))

This is due to this code, which takes an XCAR without checking whether the spec 
is a cons:

  /* Support (disable-eval PROP) which is used by enriched.el.  */
  if (CONSP (spec) && EQ (XCAR (spec), Qdisable_eval))
    {
      enable_eval = false;
      spec = XCAR (XCDR (spec));
    }

The attached patch fixes this.

Attachment: 0001-Fix-a-crash-in-handle_display_spec.patch
Description: Text Data


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