commit a9e14e85415eb326000f352bce3fcb04a125406d
author Mark Adler <fork@madler.net> Thu Oct 06 16:33:42 2022 -0700
committer Mark Adler <fork@madler.net> Thu Oct 06 20:43:18 2022 -0700
tree 68f7359d6a55e5a925610d4138dbc24e72a3af64
parent 138c93cffb76f5c24e4ae6e81e6210428856f825

Avoid undefined negation behavior if windowBits is INT_MIN.

deflate.c

diff --git a/deflate.c b/deflate.c
index 0345980..a578b1a 100644
--- a/deflate.c
+++ b/deflate.c
@@ -279,6 +279,8 @@
 
     if (windowBits < 0) { /* suppress zlib wrapper */
         wrap = 0;
+        if (windowBits < -15)
+            return Z_STREAM_ERROR;
         windowBits = -windowBits;
     }
 #ifdef GZIP

inflate.c

diff --git a/inflate.c b/inflate.c
index 2a3c4fe..8acbef4 100644
--- a/inflate.c
+++ b/inflate.c
@@ -168,6 +168,8 @@
 
     /* extract wrap request from windowBits parameter */
     if (windowBits < 0) {
+        if (windowBits < -15)
+            return Z_STREAM_ERROR;
         wrap = 0;
         windowBits = -windowBits;
     }