From: Sebastian Pop <s.pop@samsung.com>
Date: Wed, 6 Mar 2019 20:33:49 +0000 (-0600)
Subject: fix UBSan warnings of unsigned overflow
X-Git-Tag: 1.9.9-b1~503
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5aec3f78623499a1cd411fadd1cad8639936bc08;p=thirdparty%2Fzlib-ng.git

fix UBSan warnings of unsigned overflow
---

diff --git a/memcopy.h b/memcopy.h
index fdccba5e..e0e82c7a 100644
--- a/memcopy.h
+++ b/memcopy.h
@@ -65,10 +65,11 @@ static inline unsigned char* chunkcopy(unsigned char *out, unsigned char const *
     out += (len % INFFAST_CHUNKSIZE) + 1;
     from += (len % INFFAST_CHUNKSIZE) + 1;
     len /= INFFAST_CHUNKSIZE;
-    while (len-- > 0) {
+    while (len > 0) {
         storechunk(out, loadchunk(from));
         out += INFFAST_CHUNKSIZE;
         from += INFFAST_CHUNKSIZE;
+        --len;
     }
     return out;
 }