From cb4f93b0b373fb30800b379faf83e7f3d5d26f4c Mon Sep 17 00:00:00 2001
From: tb <tb@openbsd.org>
Date: Tue, 15 Aug 2023 12:18:46 +0000
Subject: [PATCH] Fix bug when using gzflush() with a very small buffer.

from upstream
---
 lib/libz/gzlib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/libz/gzlib.c b/lib/libz/gzlib.c
index 2b446c448f0..29fc4486fba 100644
--- a/lib/libz/gzlib.c
+++ b/lib/libz/gzlib.c
@@ -308,8 +308,8 @@ int ZEXPORT gzbuffer(gzFile file, unsigned size) {
     /* check and set requested size */
     if ((size << 1) < size)
         return -1;              /* need to be able to double it */
-    if (size < 2)
-        size = 2;               /* need two bytes to check magic header */
+    if (size < 8)
+        size = 8;               /* needed to behave well with flushing */
     state->want = size;
     return 0;
 }
-- 
2.20.1