From: Mark Adler <madler@alumni.caltech.edu>
Date: Mon, 21 Aug 2023 20:49:50 +0000 (-0700)
Subject: Fix bug when using gzflush() with a very small buffer.
X-Git-Tag: 2.1.4~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe44e1f1dfa7698b8f42a6eeb392548d3fdf9a81;p=thirdparty%2Fzlib-ng.git

Fix bug when using gzflush() with a very small buffer.
---

diff --git a/gzlib.c b/gzlib.c
index e1290fc61..e613837ef 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -274,8 +274,8 @@ int Z_EXPORT PREFIX(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;
 }