From e9446f2f9510418e08bb1a77e78bfaa487ef860c Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
Date: Sat, 23 Nov 2013 12:14:02 -0600
Subject: [PATCH] [libpng17] Added an "assert()" to pngfix.c to quiet a clang
 scanner warning.

---
 contrib/tools/pngfix.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contrib/tools/pngfix.c b/contrib/tools/pngfix.c
index 50576e607..3c70b81ad 100644
--- a/contrib/tools/pngfix.c
+++ b/contrib/tools/pngfix.c
@@ -2,7 +2,7 @@
  *
  * Copyright (c) 2013 John Cunningham Bowler
  *
- * Last changed in libpng 1.7.0 [(PENDING RELEASE)]
+ * Last changed in libpng 1.6.8 [(PENDING RELEASE)]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -3336,6 +3336,8 @@ read_callback(png_structp png_ptr, png_bytep buffer, size_t count)
             /* FALL THROUGH */
 
          default:
+            assert(chunk != NULL);
+
             /* NOTE: the arithmetic below overflows and gives a large positive
              * png_uint_32 value until the whole chunk data has been written.
              */