Re: PATCH: Fix multibyte memory allocation in `wcs_ztrdup()'

[Peter Stephenson <Peter.Stephenson@csr.com>]

On Mon, 28 Feb 2011 11:35:00 +0100
Frank Terbeck <ft@bewatermyfriend.org> wrote:
> This was spotted by Thorsten Glaser from the mirbsd project.
> 
> `zalloc()' uses malloc(3) to allocate memory. wcslen(3) returns the
> number of multibyte *characters* in a given string (N). The
> destination string will have to be able to store N+1 wchar_ts, not
> N+1 bytes.

Thanks... and it needs to be a wide NULL (L'0'), too, so another
lot of parentheses is needed.

Index: Src/string.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/string.c,v
retrieving revision 1.10
diff -p -u -r1.10 string.c
--- Src/string.c	6 Jul 2007 21:52:39 -0000	1.10
+++ Src/string.c	28 Feb 2011 11:51:46 -0000
@@ -64,7 +64,7 @@ wcs_ztrdup(const wchar_t *s)
 
     if (!s)
 	return NULL;
-    t = (wchar_t *)zalloc(wcslen((wchar_t *)s) + 1);
+    t = (wchar_t *)zalloc(sizeof(wchar_t) * (wcslen((wchar_t *)s) + 1));
     wcscpy(t, s);
     return t;
 }

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
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