commit 6c7459e455a4f7d95c7700e9326bb12396e6eb1f
author Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Fri May 27 20:09:23 2016 -0500
committer Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Fri May 27 20:09:23 2016 -0500
tree 86f103fc18ea83e22a5cb931768c4e8507313ff3
parent 8d1672537324d99c6e65eb78fc1678cdd46f75bd

[libpng16] Ensure png_ptr->trans_values is set in png_set_tRNS().

pngset.c

diff --git a/pngset.c b/pngset.c
index 6e9c50a..5c72dad 100644
--- a/pngset.c
+++ b/pngset.c
@@ -955,10 +955,11 @@
        if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
        {
          /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
-          png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
+          info_ptr->trans_alpha = png_voidcast(png_bytep,
              png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
           memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
        }
+       png_ptr->trans_alpha = info_ptr->trans_alpha;
    }
 
    if (trans_color != NULL)