GNU bug report logs - #24064
24.5; NULL pointer dereference in compute_motion(), indent.c

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Sergei Litvin <litvindev <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; NULL pointer dereference in compute_motion(), indent.c
Date: Mon, 25 Jul 2016 02:51:40 +0300

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Package: emacs

Version: 24.5

struct position *
compute_motion (ptrdiff_t from, ptrdiff_t frombyte, EMACS_INT fromvpos,
        EMACS_INT fromhpos, bool did_motion, ptrdiff_t to,
        EMACS_INT tovpos, EMACS_INT tohpos, EMACS_INT width,
        ptrdiff_t hscroll, int tab_offset, struct window *win)
{

...

  if (dp == buffer_display_table ())
    width_table = (VECTORP (BVAR (current_buffer, width_table))
                   ? XVECTOR (BVAR (current_buffer, width_table))->contents
                   : 0);
  else
    /* If the window has its own display table, we can't use the width
       run cache, because that's based on the buffer's display table.  */
    width_table = 0; // initialize it with 0 (current buffer has no 
display table)

...

      if (width_cache)
        {
          /* Is this character part of the current run?  If so, extend
         the run.  */
          if (pos - 1 == width_run_end
          && XFASTINT (width_table[c]) == width_run_width) // 
dereference width_table here, and crash
        width_run_end = pos;
...


Sergei Litvin

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