From: ceriel <none@none>
Date: Tue, 31 Oct 1989 09:44:21 +0000 (+0000)
Subject: if malloc can return 0 on a 0 argument, free should also accept 0
X-Git-Tag: release-5-5~2125
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=cccb0dd197ae20c94e45fa0622ebaf463504171b;p=ack.git

if malloc can return 0 on a 0 argument, free should also accept 0
---

diff --git a/modules/src/malloc/mal.c b/modules/src/malloc/mal.c
index 7043f19e8..5ff02b0fe 100644
--- a/modules/src/malloc/mal.c
+++ b/modules/src/malloc/mal.c
@@ -152,7 +152,13 @@ malloc(n)
 free(addr)
 	char *addr;
 {check_mallinks("free entry");{
-	register mallink *ml = mallink_of_block(addr);
+	register mallink *ml;
+	
+	if (addr == 0) {
+		check_mallinks("free(0) very fast exit");
+		return;
+	}
+	ml = mallink_of_block(addr);
 
 #ifdef STORE