vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
		      struct iov_iter *iter,
		      struct scatterlist *sg, int sg_count)
{
	size_t off = iter->iov_offset;
	int i, ret;

	for (i = 0; i < iter->nr_segs; i++) {
		void __user *base = iter->iov[i].iov_base + off;
		size_t len = iter->iov[i].iov_len - off;

		ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
		if (ret < 0) {
			for (i = 0; i < sg_count; i++) {
				struct page *page = sg_page(&sg[i]);
				if (page)
					put_page(page);
			}
			return ret;
		}
		sg += ret;
		off = 0;
	}
	return 0;
}

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.