From 02a6049eb3884c430268bb0fe3296d597a03174c Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Mon, 26 Dec 2022 23:36:01 -0800
Subject: [PATCH] Fix crash when gzsetparams() attempted for transparent write.

gzsetparams() now returns a Z_STREAM_ERROR in this case.
---
 gzwrite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gzwrite.c b/gzwrite.c
index eb8a0e5..3030d74 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -609,7 +609,7 @@ int ZEXPORT gzsetparams(file, level, strategy)
     strm = &(state->strm);
 
     /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
+    if (state->mode != GZ_WRITE || state->err != Z_OK || state->direct)
         return Z_STREAM_ERROR;
 
     /* if no change is requested, then do nothing */