File libpng15-CVE-2015-8126-complete.patch of Package libpng15.1676

https://github.com/glennrp/libpng/commit/0a9afc12dea0949c2040a42ad1342f7a4b6296f2
--- pngset.c
+++ pngset.c
@@ -520,8 +520,8 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   max_palette_length = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
-      (1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
+   max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
+      (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
 
    if (num_palette < 0 || num_palette > (int) max_palette_length)
    {