static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
			 struct fuse_notify_retrieve_out *outarg)
{
	int err;
	struct address_space *mapping = inode->i_mapping;
	struct fuse_req *req;
	pgoff_t index;
	loff_t file_size;
	unsigned int num;
	unsigned int offset;
	size_t total_len = 0;

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	offset = outarg->offset & ~PAGE_CACHE_MASK;

	req->in.h.opcode = FUSE_NOTIFY_REPLY;
	req->in.h.nodeid = outarg->nodeid;
	req->in.numargs = 2;
	req->in.argpages = 1;
	req->page_offset = offset;
	req->end = fuse_retrieve_end;

	index = outarg->offset >> PAGE_CACHE_SHIFT;
	file_size = i_size_read(inode);
	num = outarg->size;
	if (outarg->offset > file_size)
		num = 0;
	else if (outarg->offset + num > file_size)
		num = file_size - outarg->offset;

	while (num) {
		struct page *page;
		unsigned int this_num;

		page = find_get_page(mapping, index);
		if (!page)
			break;

		this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
		req->pages[req->num_pages] = page;
		req->num_pages++;

		num -= this_num;
		total_len += this_num;
	}
	req->misc.retrieve_in.offset = outarg->offset;
	req->misc.retrieve_in.size = total_len;
	req->in.args[0].size = sizeof(req->misc.retrieve_in);
	req->in.args[0].value = &req->misc.retrieve_in;
	req->in.args[1].size = total_len;

	err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique);
	if (err)
		fuse_retrieve_end(fc, req);

	return err;
}

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.