static void glfs_async_cbk(glfs_fd_t *fd, ssize_t ret, void *data)
{
	glfs_cbk_cookie *cookie = data;
	struct tcmu_device *dev = cookie->dev;
	struct tcmulib_cmd *cmd = cookie->cmd;
	size_t length = cookie->length;

	if (ret < 0 || ret != length) {
		/* Read/write/flush failed */
		switch (cookie->op) {
		case TCMU_GLFS_READ:
			ret =  tcmu_set_sense_data(cmd->sense_buf, MEDIUM_ERROR,
			                           ASC_READ_ERROR, NULL);
			break;
		case TCMU_GLFS_WRITE:
		case TCMU_GLFS_FLUSH:
			ret =  tcmu_set_sense_data(cmd->sense_buf, MEDIUM_ERROR,
			                           ASC_WRITE_ERROR, NULL);
			break;
		}
	} else {
		ret = SAM_STAT_GOOD;
	}

	cmd->done(dev, cmd, ret);
	free(cookie);
}

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.