Re: One more warning about using an uninitialized field

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 23 Jan 2014 13:08:18 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> CC: Emacs development discussions <emacs-devel@gnu.org>
> 
> One more warning about using an uninitialized field, now BIDI-related:
> 
> ==11279== Conditional jump or move depends on uninitialised value(s)
> ==11279==    at 0x443145: compute_display_string_pos (xdisp.c:3582)
> ==11279==    by 0x500D93: bidi_fetch_char (bidi.c:953)
> ==11279==    by 0x501FF9: bidi_paragraph_init (bidi.c:1299)
> ==11279==    by 0x47AEAE: Fcurrent_bidi_paragraph_direction (xdisp.c:20419)
> 
>  From xdisp.c:
> 
>    3579    if (charpos >= eob
>    3580        /* We don't support display properties whose values are strings
>    3581           that have display string properties.  */
> ! 3582        || string->from_disp_str
>    3583        /* C strings cannot have display properties.  */
>    3584        || (string->s && !STRINGP (object)))
>    3585      {
>    3586        *disp_prop = 0;
>    3587        return eob;
>    3588      }
> 
> I don't know how critical it may be, but please consider the following precaution:
> 
> === modified file 'src/xdisp.c'
> --- src/xdisp.c	2014-01-13 11:30:30 +0000
> +++ src/xdisp.c	2014-01-23 08:53:41 +0000
> @@ -6409,6 +6409,7 @@
>         it->bidi_it.string.s = NULL;
>         it->bidi_it.string.lstring = Qnil;
>         it->bidi_it.string.bufpos = 0;
> +      it->bidi_it.string.from_disp_str = 0;
>         it->bidi_it.string.unibyte = 0;
>         it->bidi_it.w = it->w;
>       }
> @@ -20411,6 +20412,7 @@
>         itb.string.s = NULL;
>         itb.string.lstring = Qnil;
>         itb.string.bufpos = 0;
> +      itb.string.from_disp_str = 0;
>         itb.string.unibyte = 0;
>         /* We have no window to use here for ignoring window-specific
>   	 overlays.  Using NULL for window pointer will cause

Thanks, please install these.