realloc(ptr, 0) does not free; from seebs@taniemarie.solon.com;

netbsd pr#1806

src/lib/libc/stdlib/malloc.c

@@ -1,3 +1,5 @@
+/*	$NetBSD: malloc.c,v 1.6 1996/01/17 02:45:25 jtc Exp $	*/
+
 /*
  * Copyright (c) 1983 Regents of the University of California.
  * All rights reserved.
@@ -32,8 +34,11 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-/*static char *sccsid = "from: @(#)malloc.c	5.11 (Berkeley) 2/23/91";*/
-static char *rcsid = "$Id: malloc.c,v 1.1.1.1 1995/10/18 08:42:18 deraadt Exp $";
+#if 0
+static char *sccsid = "from: @(#)malloc.c	5.11 (Berkeley) 2/23/91";
+#else
+static char *rcsid = "$NetBSD: malloc.c,v 1.6 1996/01/17 02:45:25 jtc Exp $";
+#endif
 #endif /* LIBC_SCCS and not lint */
 
 /*
@@ -310,6 +315,10 @@ realloc(cp, nbytes)
 
   	if (cp == NULL)
   		return (malloc(nbytes));
+	if (nbytes == 0) {
+		free (cp);
+		return NULL;
+	}
 	op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
 	if (op->ov_magic == MAGIC) {
 		was_alloced++;