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Re: segfault completing "foo$"
- X-seq: zsh-workers 23794
- From: Peter Stephenson <pws@xxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: Re: segfault completing "foo$"
- Date: Wed, 22 Aug 2007 17:54:23 +0100
- In-reply-to: <20070822160237.GA23377@xxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- Organization: CSR
- References: <20070822160237.GA23377@xxxxxxxxxxx>
On Wed, 22 Aug 2007 12:02:37 -0400
Clint Adams <clint@xxxxxxx> wrote:
> Type "foo$"<TAB><TAB><TAB> (1-3 tabs, depending on setup, I think) to
> segfault zsh.
That's never been properly handled, I don't think, but in 4.2 it didn't
cause a segfault, simply assigned a duff number in the parameter suffix
table. The code implies that could do dire things later on, but I don't
know if it did. Now we actually use the invalid value for creating a
prefix string to analyse, which causes the crash. I think the immediate
fix is simply "don't do that". I don't think parameter completion should
even be active in this case, but there's no way I'm going down that route.
This parq business is in the "not even obscure" category.
Index: Src/Zle/compresult.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/compresult.c,v
retrieving revision 1.71
diff -u -r1.71 compresult.c
--- Src/Zle/compresult.c 28 May 2007 13:08:48 -0000 1.71
+++ Src/Zle/compresult.c 22 Aug 2007 16:47:57 -0000
@@ -1148,7 +1148,7 @@
makesuffixstr(m->remf, m->rems, 1);
}
}
- if (minfo.we && partest && isset(AUTOPARAMKEYS)) {
+ if (minfo.we && partest && isset(AUTOPARAMKEYS) && minfo.insc - parq > 0) {
/* the suffix code needs numbers of characters, not octets */
int outlen;
char *tmpstr = dupstrpfx(zlemetaline + parq, minfo.insc - parq);
--
Peter Stephenson <pws@xxxxxxx> Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK Tel: +44 (0)1223 692070
.
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