png_set_sPLT(png_structp png_ptr,
             png_infop info_ptr, png_sPLT_tp entries, int nentries)
/*
 *  entries        - array of png_sPLT_t structures
 *                   to be added to the list of palettes
 *                   in the info structure.
 *  nentries       - number of palette structures to be
 *                   added.
 */
{
   png_sPLT_tp np;
   int i;

   if (png_ptr == NULL || info_ptr == NULL)
      return;

   np = (png_sPLT_tp)png_malloc_warn(png_ptr,
       (info_ptr->splt_palettes_num + nentries) *
        (png_uint_32)png_sizeof(png_sPLT_t));
   if (np == NULL)
   {
      png_warning(png_ptr, "No memory for sPLT palettes.");
      return;
   }

   png_memcpy(np, info_ptr->splt_palettes,
       info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
   png_free(png_ptr, info_ptr->splt_palettes);
   info_ptr->splt_palettes=NULL;

   for (i = 0; i < nentries; i++)
   {
      png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
      png_sPLT_tp from = entries + i;
      png_uint_32 length;

      length = png_strlen(from->name) + 1;
      to->name = (png_charp)png_malloc_warn(png_ptr, length);
      if (to->name == NULL)
      {
         png_warning(png_ptr,
           "Out of memory while processing sPLT chunk");
         continue;
      }
      png_memcpy(to->name, from->name, length);
      to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
          (png_uint_32)(from->nentries * png_sizeof(png_sPLT_entry)));
      if (to->entries == NULL)
      {
         png_warning(png_ptr,
           "Out of memory while processing sPLT chunk");
         png_free(png_ptr, to->name);
         to->name = NULL;
         continue;
      }
      png_memcpy(to->entries, from->entries,
          from->nentries * png_sizeof(png_sPLT_entry));
      to->nentries = from->nentries;
      to->depth = from->depth;
   }

   info_ptr->splt_palettes = np;
   info_ptr->splt_palettes_num += nentries;
   info_ptr->valid |= PNG_INFO_sPLT;
#ifdef PNG_FREE_ME_SUPPORTED
   info_ptr->free_me |= PNG_FREE_SPLT;
#endif
}

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.