From 916117d97058b37e7eef2558a71919a8a073a3d3 Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
Date: Thu, 29 Mar 2018 10:37:12 -0500
Subject: [PATCH] [libpng16] Allow compresion-type to be NULL in
 png_set_iCCP().

---
 pngget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pngget.c b/pngget.c
index 5c435dcdc..b888db366 100644
--- a/pngget.c
+++ b/pngget.c
@@ -749,7 +749,8 @@ png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
       /* This is somewhat irrelevant since the profile data returned has
        * actually been uncompressed.
        */
-      *compression_type = PNG_COMPRESSION_TYPE_BASE;
+      if (compression_type != NULL)
+         *compression_type = PNG_COMPRESSION_TYPE_BASE;
       return (PNG_INFO_iCCP);
    }