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From: David Schultz <das@FreeBSD.org>
Date: Sat, 21 Apr 2012 06:08:30 +0000 (UTC)
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Subject: svn commit: r234529 - head/lib/libc/stdio
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Author: das
Date: Sat Apr 21 06:08:29 2012
New Revision: 234529
URL: http://svn.freebsd.org/changeset/base/234529

Log:
  Ensure that the {,v}swprintf functions always null-terminate the
  output string, even if an encoding error or malloc failure occurs.

Modified:
  head/lib/libc/stdio/vswprintf.c

Modified: head/lib/libc/stdio/vswprintf.c
==============================================================================
--- head/lib/libc/stdio/vswprintf.c	Sat Apr 21 06:08:02 2012	(r234528)
+++ head/lib/libc/stdio/vswprintf.c	Sat Apr 21 06:08:29 2012	(r234529)
@@ -66,6 +66,7 @@ vswprintf_l(wchar_t * __restrict s, size
 	f._bf._base = f._p = (unsigned char *)malloc(128);
 	if (f._bf._base == NULL) {
 		errno = ENOMEM;
+		*s = L'\0';
 		return (-1);
 	}
 	f._bf._size = f._w = 127;		/* Leave room for the NUL */
@@ -74,6 +75,7 @@ vswprintf_l(wchar_t * __restrict s, size
 		sverrno = errno;
 		free(f._bf._base);
 		errno = sverrno;
+		*s = L'\0';
 		return (-1);
 	}
 	*f._p = '\0';
@@ -87,6 +89,7 @@ vswprintf_l(wchar_t * __restrict s, size
 	free(f._bf._base);
 	if (nwc == (size_t)-1) {
 		errno = EILSEQ;
+		*s = L'\0';
 		return (-1);
 	}
 	if (nwc == n) {