cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
{
	int rc;
	unsigned int xid;

	xid = get_xid();
/* BB add check for wbc flags */
	page_cache_get(page);
	if (!PageUptodate(page))
		cifs_dbg(FYI, "ppw - page not up to date\n");

	/*
	 * Set the "writeback" flag, and clear "dirty" in the radix tree.
	 *
	 * A writepage() implementation always needs to do either this,
	 * or re-dirty the page with "redirty_page_for_writepage()" in
	 * the case of a failure.
	 *
	 * Just unlocking the page will cause the radix tree tag-bits
	 * to fail to update with the state of the page correctly.
	 */
	set_page_writeback(page);
retry_write:
	rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
	if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
		goto retry_write;
	else if (rc == -EAGAIN)
		redirty_page_for_writepage(wbc, page);
	else if (rc != 0)
		SetPageError(page);
	else
		SetPageUptodate(page);
	end_page_writeback(page);
	page_cache_release(page);
	free_xid(xid);
	return rc;
}

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.