CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
		const __u16 smb_file_id, const int get_flag, const __u64 len,
		struct file_lock *pLockData, const __u16 lock_type,
		const bool waitFlag)
{
	struct smb_com_transaction2_sfi_req *pSMB  = NULL;
	struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
	struct cifs_posix_lock *parm_data;
	int rc = 0;
	int timeout = 0;
	int bytes_returned = 0;
	int resp_buf_type = 0;
	__u16 params, param_offset, offset, byte_count, count;
	struct kvec iov[1];

	cFYI(1, "Posix Lock");

	if (pLockData == NULL)
		return -EINVAL;

	rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);

	if (rc)
		return rc;

	pSMBr = (struct smb_com_transaction2_sfi_rsp *)pSMB;

	params = 6;
	pSMB->MaxSetupCount = 0;
	pSMB->Reserved = 0;
	pSMB->Flags = 0;
	pSMB->Reserved2 = 0;
	param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
	offset = param_offset + params;

	count = sizeof(struct cifs_posix_lock);
	pSMB->MaxParameterCount = cpu_to_le16(2);
	pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB from sess */
	pSMB->SetupCount = 1;
	pSMB->Reserved3 = 0;
	if (get_flag)
		pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
	else
		pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
	byte_count = 3 /* pad */  + params + count;
	pSMB->DataCount = cpu_to_le16(count);
	pSMB->ParameterCount = cpu_to_le16(params);
	pSMB->TotalDataCount = pSMB->DataCount;
	pSMB->TotalParameterCount = pSMB->ParameterCount;
	pSMB->ParameterOffset = cpu_to_le16(param_offset);
	parm_data = (struct cifs_posix_lock *)
			(((char *) &pSMB->hdr.Protocol) + offset);

	parm_data->lock_type = cpu_to_le16(lock_type);
	if (waitFlag) {
		timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
		parm_data->lock_flags = cpu_to_le16(1);
		pSMB->Timeout = cpu_to_le32(-1);
	} else
		pSMB->Timeout = 0;

	parm_data->pid = cpu_to_le32(current->tgid);
	parm_data->start = cpu_to_le64(pLockData->fl_start);
	parm_data->length = cpu_to_le64(len);  /* normalize negative numbers */

	pSMB->DataOffset = cpu_to_le16(offset);
	pSMB->Fid = smb_file_id;
	pSMB->InformationLevel = cpu_to_le16(SMB_SET_POSIX_LOCK);
	pSMB->Reserved4 = 0;
	inc_rfc1001_len(pSMB, byte_count);
	pSMB->ByteCount = cpu_to_le16(byte_count);
	if (waitFlag) {
		rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,
			(struct smb_hdr *) pSMBr, &bytes_returned);
	} else {
		iov[0].iov_base = (char *)pSMB;
		iov[0].iov_len = be32_to_cpu(pSMB->hdr.smb_buf_length) + 4;
		rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovecs */,
				&resp_buf_type, timeout);
		pSMB = NULL; /* request buf already freed by SendReceive2. Do
				not try to free it twice below on exit */
		pSMBr = (struct smb_com_transaction2_sfi_rsp *)iov[0].iov_base;
	}

	if (rc) {
		cFYI(1, "Send error in Posix Lock = %d", rc);
	} else if (get_flag) {
		/* lock structure can be returned on get */
		__u16 data_offset;
		__u16 data_count;
		rc = validate_t2((struct smb_t2_rsp *)pSMBr);

		if (rc || get_bcc(&pSMBr->hdr) < sizeof(*parm_data)) {
			rc = -EIO;      /* bad smb */
			goto plk_err_exit;
		}
		data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
		data_count  = le16_to_cpu(pSMBr->t2.DataCount);
		if (data_count < sizeof(struct cifs_posix_lock)) {
			rc = -EIO;
			goto plk_err_exit;
		}
		parm_data = (struct cifs_posix_lock *)
			((char *)&pSMBr->hdr.Protocol + data_offset);
		if (parm_data->lock_type == __constant_cpu_to_le16(CIFS_UNLCK))
			pLockData->fl_type = F_UNLCK;
		else {
			if (parm_data->lock_type ==
					__constant_cpu_to_le16(CIFS_RDLCK))
				pLockData->fl_type = F_RDLCK;
			else if (parm_data->lock_type ==
					__constant_cpu_to_le16(CIFS_WRLCK))
				pLockData->fl_type = F_WRLCK;

			pLockData->fl_start = le64_to_cpu(parm_data->start);
			pLockData->fl_end = pLockData->fl_start +
					le64_to_cpu(parm_data->length) - 1;
			pLockData->fl_pid = le32_to_cpu(parm_data->pid);
		}
	}

plk_err_exit:
	if (pSMB)
		cifs_small_buf_release(pSMB);

	if (resp_buf_type == CIFS_SMALL_BUFFER)
		cifs_small_buf_release(iov[0].iov_base);
	else if (resp_buf_type == CIFS_LARGE_BUFFER)
		cifs_buf_release(iov[0].iov_base);

	/* Note: On -EAGAIN error only caller can retry on handle based calls
	   since file handle passed in no longer valid */

	return rc;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.