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Re: PATCH: Re: Seg fault in matcher-list matching
- X-seq: zsh-workers 11374
- From: Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxxxxxx
- Subject: Re: PATCH: Re: Seg fault in matcher-list matching
- Date: Mon, 15 May 2000 13:52:17 +0200 (MET DST)
- In-reply-to: "Bart Schaefer"'s message of Mon, 15 May 2000 11:44:55 +0000
- Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm
Bart Schaefer wrote:
> ...
>
> It doesn't dump for me any more, but I'm still nervous about line 1767 of
> compcore.c:
>
> #1 0x80bd798 in addmatches (dat=0xbfffa854, argv=0xbfffa8d8)
> at ../../../zsh-3.1.6/Src/Zle/compcore.c:1768
> 1768 if ((ml = match_str(lsuf, s, &bsl, 0, NULL, 1, 0, 1)) >= 0) {
> (gdb) l
> 1763 else
> 1764 *argv = NULL;
> 1765 bcp = lpl;
> 1766 }
> 1767 s = dat->psuf ? dat->psuf : "";
> 1768 if ((ml = match_str(lsuf, s, &bsl, 0, NULL, 1, 0, 1)) >= 0) {
> 1769 if (matchsubs) {
> 1770 Cline tmp = get_cline(NULL, 0, NULL, 0, NULL, 0, CLF_SUF);
> 1771
> 1772 tmp->suffix = matchsubs;
>
> The reported core dump was caused because match_str() wrote a '\0' byte into
> the string pointed to by its second argument [`s' above, `w' in match_str()]
> which is being passed as a string constant when dat->psuf == 0.
Yes, I know.
> Is that a
> potential bug, still?
I'm pretty sure I made sure that we don't try to write into strings we
can't write into with the patch I sent. But I'll also commit the one
below for some extra savety.
Bye
Sven
Index: Src/Zle/compcore.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/compcore.c,v
retrieving revision 1.19
diff -u -r1.19 compcore.c
--- Src/Zle/compcore.c 2000/05/12 07:03:41 1.19
+++ Src/Zle/compcore.c 2000/05/15 11:52:03
@@ -1739,7 +1739,7 @@
llpl -= gfl;
}
}
- s = dat->ppre ? dat->ppre : "";
+ s = dat->ppre ? dat->ppre : dupstring("");
if ((ml = match_str(lpre, s, &bpl, 0, NULL, 0, 0, 1)) >= 0) {
if (matchsubs) {
Cline tmp = get_cline(NULL, 0, NULL, 0, NULL, 0, 0);
@@ -1757,14 +1757,14 @@
bpadd = strlen(s) - ml;
} else {
if (llpl <= lpl && strpfx(lpre, s))
- lpre = "";
+ lpre = dupstring("");
else if (llpl > lpl && strpfx(s, lpre))
lpre += lpl;
else
*argv = NULL;
bcp = lpl;
}
- s = dat->psuf ? dat->psuf : "";
+ s = dat->psuf ? dat->psuf : dupstring("");
if ((ml = match_str(lsuf, s, &bsl, 0, NULL, 1, 0, 1)) >= 0) {
if (matchsubs) {
Cline tmp = get_cline(NULL, 0, NULL, 0, NULL, 0, CLF_SUF);
@@ -1782,7 +1782,7 @@
bsadd = strlen(s) - ml;
} else {
if (llsl <= lsl && strsfx(lsuf, s))
- lsuf = "";
+ lsuf = dupstring("");
else if (llsl > lsl && strsfx(s, lsuf))
lsuf[llsl - lsl] = '\0';
else
--
Sven Wischnowsky wischnow@xxxxxxxxxxxxxxxxxxxxxxx
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