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Message-Id: <20170627175847.13827-1-amonakov@ispras.ru>
Date: Tue, 27 Jun 2017 20:58:47 +0300
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: [PATCH] fix undefined behavior in free
---
src/malloc/malloc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c
index 720fa696..ef4c7368 100644
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -463,14 +463,15 @@ 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;
--
2.11.0
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