From 1aabcfdbaed72d091216579463dfd511ad1a7a3e Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
Date: Sun, 10 Sep 2017 05:45:44 -0500
Subject: [PATCH] [libpng16] Trying to isolate oss-fuzz issue in
 png_set_text_2().

---
 pngset.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/pngset.c b/pngset.c
index 6d441049f..15531bbe6 100644
--- a/pngset.c
+++ b/pngset.c
@@ -889,7 +889,18 @@ png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
       if (text_ptr[i].text[0] == '\0')
          text_0_is_0=1;
 
-      if (text_is_null || text_0_is_0)
+      if (text_is_null)
+      {
+         text_length = 0;
+#  ifdef PNG_iTXt_SUPPORTED
+         if (text_ptr[i].compression > 0)
+            textp->compression = PNG_ITXT_COMPRESSION_NONE;
+
+         else
+#  endif
+            textp->compression = PNG_TEXT_COMPRESSION_NONE;
+      }
+      else if (text_0_is_0)
       {
          text_length = 0;
 #  ifdef PNG_iTXt_SUPPORTED