From: Mark Adler <zlib@madler.net>
Date: Fri, 13 Oct 2017 02:27:59 +0000 (-0700)
Subject: Avoid an undefined behavior of memcpy() in gzappend().
X-Git-Tag: v1.2.12~46
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=ae49d1472ec176ddc53a3a4905f91d46344386e6;p=zlib.git

Avoid an undefined behavior of memcpy() in gzappend().
---

diff --git a/examples/gzappend.c b/examples/gzappend.c
index 662dec3..d7eea3e 100644
--- a/examples/gzappend.c
+++ b/examples/gzappend.c
@@ -137,7 +137,7 @@ local void rotate(unsigned char *list, unsigned len, unsigned rot)
     /* do simple left shift by one */
     if (rot == 1) {
         tmp = *list;
-        memcpy(list, list + 1, len - 1);
+        memmove(list, list + 1, len - 1);
         *last = tmp;
         return;
     }