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bug#6855: 24.0.50; Bug in tool bar label handling

From: Johan Bockgård
Subject: bug#6855: 24.0.50; Bug in tool bar label handling
Date: Sat, 14 Aug 2010 14:04:25 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

There are some bugs in the handling of tool bar labels that can cause
Emacs to crash.

### gtkutil.c: update_frame_tool_bar ###

    char *label = SSDATA (PROP (TOOL_BAR_ITEM_LABEL));

Here we take string data out.

### keyboard.c: parse_tool_bar_item ###

      else if (EQ (key, QClabel))
          /* `:label LABEL-STRING'.  */
          PROP (TOOL_BAR_ITEM_LABEL) = value;
          have_label = 1;

But here we put an arbitrary object in.


  if (!have_label)

      char buf[64];
      EMACS_INT max_lbl = 2*tool_bar_max_label_size;
      Lisp_Object new_lbl;

      if (strlen (caption) < max_lbl && caption[0] != '\0')
          strcpy (buf, caption);

tool-bar-max-label-size is a user variable, so this can mean a buffer

      if (SCHARS (new_lbl) <= tool_bar_max_label_size)
        PROP (TOOL_BAR_ITEM_LABEL) = new_lbl;

If we came here but the branch is not taken, the label will be nil,
not a string.

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