From: Alexander Monakov <amonakov@ispras.ru>
Date: Tue, 27 Jun 2017 17:58:47 +0000 (+0300)
Subject: fix undefined behavior in free
X-Git-Tag: v1.1.17~41
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=60ab365cae24063b0f21821860ca16fb63e81f81;p=oweals%2Fmusl.git

fix undefined behavior in free
---

diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c
index d5ee4280..9e05e1d6 100644
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -450,14 +450,15 @@ copy_realloc:
 
 void free(void *p)
 {
-	struct chunk *self = MEM_TO_CHUNK(p);
-	struct chunk *next;
+	struct chunk *self, *next;
 	size_t final_size, new_size, size;
 	int reclaim=0;
 	int i;
 
 	if (!p) return;
 
+	self = MEM_TO_CHUNK(p);
+
 	if (IS_MMAPPED(self)) {
 		size_t extra = self->psize;
 		char *base = (char *)self - extra;