From 95698093f023852ca4365df307c19a1d7cfa3687 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Sun, 5 Jul 2015 18:14:53 -0700
Subject: Improve speed of gzprintf() in transparent mode.

---
 gzlib.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'gzlib.c')

diff --git a/gzlib.c b/gzlib.c
index ced2cb8..3e344f9 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -331,6 +331,8 @@ int ZEXPORT gzbuffer(file, size)
         return -1;
 
     /* 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 */
     state->want = size;
-- 
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