png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
   png_charp profile, int profile_len)
{
#ifdef PNG_USE_LOCAL_ARRAYS
   PNG_iCCP;
#endif
   png_size_t name_len;
   png_charp new_name;
   compression_state comp;
   int embedded_profile_len = 0;

   png_debug(1, "in png_write_iCCP");

   comp.num_output_ptr = 0;
   comp.max_output_ptr = 0;
   comp.output_ptr = NULL;
   comp.input = NULL;
   comp.input_len = 0;

   if ((name_len = png_check_keyword(png_ptr, name,
      &new_name)) == 0)
      return;

   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
      png_warning(png_ptr, "Unknown compression type in iCCP chunk");

   if (profile == NULL)
      profile_len = 0;

   if (profile_len > 3)
      embedded_profile_len =
          ((*( (png_bytep)profile    ))<<24) |
          ((*( (png_bytep)profile + 1))<<16) |
          ((*( (png_bytep)profile + 2))<< 8) |
          ((*( (png_bytep)profile + 3))    );

   if (embedded_profile_len < 0)
   {
      png_warning(png_ptr,
        "Embedded profile length in iCCP chunk is negative");
      png_free(png_ptr, new_name);
      return;
   }

   if (profile_len < embedded_profile_len)
   {
      png_warning(png_ptr,
        "Embedded profile length too large in iCCP chunk");
      png_free(png_ptr, new_name);
      return;
   }

   if (profile_len > embedded_profile_len)
   {
      png_warning(png_ptr,
        "Truncating profile to actual length in iCCP chunk");
      profile_len = embedded_profile_len;
   }

   if (profile_len)
      profile_len = png_text_compress(png_ptr, profile,
        (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp);

   /* Make sure we include the NULL after the name and the compression type */
   png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
          (png_uint_32)(name_len + profile_len + 2));
   new_name[name_len + 1] = 0x00;
   png_write_chunk_data(png_ptr, (png_bytep)new_name,
     (png_size_t)(name_len + 2));

   if (profile_len)
      png_write_compressed_data_out(png_ptr, &comp);

   png_write_chunk_end(png_ptr);
   png_free(png_ptr, new_name);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.