commit 02a6049eb3884c430268bb0fe3296d597a03174c
author Mark Adler <madler@alumni.caltech.edu> Mon Dec 26 23:36:01 2022 -0800
committer Mark Adler <madler@alumni.caltech.edu> Mon Dec 26 23:38:00 2022 -0800
tree 815a3a56dee2e077baf119ca61c3d2f94d777255
parent e554695638228b846d49657f31eeff0ca4680e8a

Fix crash when gzsetparams() attempted for transparent write.

gzsetparams() now returns a Z_STREAM_ERROR in this case.

gzwrite.c

diff --git a/gzwrite.c b/gzwrite.c
index eb8a0e5..3030d74 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -609,7 +609,7 @@
     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 */