process_bmpcache2(STREAM s, uint16 flags, RD_BOOL compressed)
{
	RD_HBITMAP bitmap;
	int y;
	uint8 cache_id, cache_idx_low, width, height, Bpp;
	uint16 cache_idx, bufsize;
	uint8 *data, *bmpdata, *bitmap_id;

	bitmap_id = NULL;	/* prevent compiler warning */
	cache_id = flags & ID_MASK;
	Bpp = ((flags & MODE_MASK) >> MODE_SHIFT) - 2;

	if (flags & PERSIST)
	{
		in_uint8p(s, bitmap_id, 8);
	}

	if (flags & SQUARE)
	{
		in_uint8(s, width);
		height = width;
	}
	else
	{
		in_uint8(s, width);
		in_uint8(s, height);
	}

	in_uint16_be(s, bufsize);
	bufsize &= BUFSIZE_MASK;
	in_uint8(s, cache_idx);

	if (cache_idx & LONG_FORMAT)
	{
		in_uint8(s, cache_idx_low);
		cache_idx = ((cache_idx ^ LONG_FORMAT) << 8) + cache_idx_low;
	}

	in_uint8p(s, data, bufsize);

	logger(Graphics, Debug,
	       "process_bmpcache2(), compr=%d, flags=%x, cx=%d, cy=%d, id=%d, idx=%d, Bpp=%d, bs=%d",
	       compressed, flags, width, height, cache_id, cache_idx, Bpp, bufsize);

	bmpdata = (uint8 *) xmalloc(width * height * Bpp);

	if (compressed)
	{
		if (!bitmap_decompress(bmpdata, width, height, data, bufsize, Bpp))
		{
			logger(Graphics, Error,
			       "process_bmpcache2(), failed to decompress bitmap data");
			xfree(bmpdata);
			return;
		}
	}
	else
	{
		for (y = 0; y < height; y++)
			memcpy(&bmpdata[(height - y - 1) * (width * Bpp)],
			       &data[y * (width * Bpp)], width * Bpp);
	}

	bitmap = ui_create_bitmap(width, height, bmpdata);

	if (bitmap)
	{
		cache_put_bitmap(cache_id, cache_idx, bitmap);
		if (flags & PERSIST)
			pstcache_save_bitmap(cache_id, cache_idx, bitmap_id, width, height,
					     width * height * Bpp, bmpdata);
	}
	else
	{
		logger(Graphics, Error, "process_bmpcache2(), ui_create_bitmap(), failed");
	}

	xfree(bmpdata);
}

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.