Sync with OpenBSD: avoid memory leak when __vfprintf() fails because it

runs out of memory, always call va_end.

1 files changed, 20 insertions, 12 deletions

diff --git a/lib/libc/stdio/asprintf.c b/lib/libc/stdio/asprintf.c
index 95c22b6..214405e 100644
--- a/lib/libc/stdio/asprintf.c
+++ b/lib/libc/stdio/asprintf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: asprintf.c,v 1.4 1998/06/21 22:13:46 millert Exp $	*/
+/*	$OpenBSD: asprintf.c,v 1.8 2002/02/19 19:39:36 millert Exp $	*/
 
 /*
  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
@@ -44,27 +44,35 @@ asprintf(char **str, char const *fmt, ...)
 	va_list ap;
 	FILE f;
 	struct __sFILEX ext;
+	unsigned char *_base;
 
 	va_start(ap, fmt);
 	f._file = -1;
 	f._flags = __SWR | __SSTR | __SALC;
 	f._bf._base = f._p = (unsigned char *)malloc(128);
-	if (f._bf._base == NULL) {
-		*str = NULL;
-		errno = ENOMEM;
-		return (-1);
-	}
+	if (f._bf._base == NULL)
+		goto err;
 	f._bf._size = f._w = 127;		/* Leave room for the NUL */
 	f._extra = &ext;
 	INITEXTRA(&f);
 	ret = __vfprintf(&f, fmt, ap);		/* Use unlocked __vfprintf */
+	if (ret == -1)
+		goto err;
 	*f._p = '\0';
+	_base = realloc(f._bf._base, ret + 1);
+	if (_base == NULL)
+		goto err;
+	*str = (char *)_base;
 	va_end(ap);
-	f._bf._base = reallocf(f._bf._base, f._bf._size + 1);
-	if (f._bf._base == NULL) {
-		errno = ENOMEM;
-		ret = -1;
-	}
-	*str = (char *)f._bf._base;
 	return (ret);
+
+err:
+	va_end(ap);
+	if (f._bf._base != NULL) {
+		free(f._bf._base);
+		f._bf._base = NULL;
+	}
+	*str = NULL;
+	errno = ENOMEM;
+	return (-1);
 }