From 3fe4469bfa84ed23414f4f581c798945dcfa41f0 Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayned@samba.org>
Date: Sat, 16 Mar 2019 09:52:46 -0700
Subject: [PATCH] Fix zlib CVE-2016-9843.

---
 zlib/crc32.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/zlib/crc32.c b/zlib/crc32.c
index 979a7190..05733f4e 100644
--- a/zlib/crc32.c
+++ b/zlib/crc32.c
@@ -278,7 +278,7 @@ local unsigned long crc32_little(crc, buf, len)
 }
 
 /* ========================================================================= */
-#define DOBIG4 c ^= *++buf4; \
+#define DOBIG4 c ^= *buf4++; \
         c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
             crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
 #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
@@ -300,7 +300,6 @@ local unsigned long crc32_big(crc, buf, len)
     }
 
     buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
-    buf4--;
     while (len >= 32) {
         DOBIG32;
         len -= 32;
@@ -309,7 +308,6 @@ local unsigned long crc32_big(crc, buf, len)
         DOBIG4;
         len -= 4;
     }
-    buf4++;
     buf = (const unsigned char FAR *)buf4;
 
     if (len) do {
-- 
2.47.2