SMBLegacyOpen(const int xid, struct cifs_tcon *tcon,
	    const char *fileName, const int openDisposition,
	    const int access_flags, const int create_options, __u16 *netfid,
	    int *pOplock, FILE_ALL_INFO *pfile_info,
	    const struct nls_table *nls_codepage, int remap)
{
	int rc = -EACCES;
	OPENX_REQ *pSMB = NULL;
	OPENX_RSP *pSMBr = NULL;
	int bytes_returned;
	int name_len;
	__u16 count;

OldOpenRetry:
	rc = smb_init(SMB_COM_OPEN_ANDX, 15, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	pSMB->AndXCommand = 0xFF;       /* none */

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		count = 1;      /* account for one byte pad to word boundary */
		name_len =
		   cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
				    fileName, PATH_MAX, nls_codepage, remap);
		name_len++;     /* trailing null */
		name_len *= 2;
	} else {                /* BB improve check for buffer overruns BB */
		count = 0;      /* no pad */
		name_len = strnlen(fileName, PATH_MAX);
		name_len++;     /* trailing null */
		strncpy(pSMB->fileName, fileName, name_len);
	}
	if (*pOplock & REQ_OPLOCK)
		pSMB->OpenFlags = cpu_to_le16(REQ_OPLOCK);
	else if (*pOplock & REQ_BATCHOPLOCK)
		pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);

	pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
	pSMB->Mode = cpu_to_le16(access_flags_to_smbopen_mode(access_flags));
	pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
	/* set file as system file if special file such
	   as fifo and server expecting SFU style and
	   no Unix extensions */

	if (create_options & CREATE_OPTION_SPECIAL)
		pSMB->FileAttributes = cpu_to_le16(ATTR_SYSTEM);
	else /* BB FIXME BB */
		pSMB->FileAttributes = cpu_to_le16(0/*ATTR_NORMAL*/);

	if (create_options & CREATE_OPTION_READONLY)
		pSMB->FileAttributes |= cpu_to_le16(ATTR_READONLY);

	/* BB FIXME BB */
/*	pSMB->CreateOptions = cpu_to_le32(create_options &
						 CREATE_OPTIONS_MASK); */
	/* BB FIXME END BB */

	pSMB->Sattr = cpu_to_le16(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_DIRECTORY);
	pSMB->OpenFunction = cpu_to_le16(convert_disposition(openDisposition));
	count += name_len;
	inc_rfc1001_len(pSMB, count);

	pSMB->ByteCount = cpu_to_le16(count);
	/* long_op set to 1 to allow for oplock break timeouts */
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			(struct smb_hdr *)pSMBr, &bytes_returned, 0);
	cifs_stats_inc(&tcon->num_opens);
	if (rc) {
		cFYI(1, "Error in Open = %d", rc);
	} else {
	/* BB verify if wct == 15 */

/*		*pOplock = pSMBr->OplockLevel; */ /* BB take from action field*/

		*netfid = pSMBr->Fid;   /* cifs fid stays in le */
		/* Let caller know file was created so we can set the mode. */
		/* Do we care about the CreateAction in any other cases? */
	/* BB FIXME BB */
/*		if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
			*pOplock |= CIFS_CREATE_ACTION; */
	/* BB FIXME END */

		if (pfile_info) {
			pfile_info->CreationTime = 0; /* BB convert CreateTime*/
			pfile_info->LastAccessTime = 0; /* BB fixme */
			pfile_info->LastWriteTime = 0; /* BB fixme */
			pfile_info->ChangeTime = 0;  /* BB fixme */
			pfile_info->Attributes =
				cpu_to_le32(le16_to_cpu(pSMBr->FileAttributes));
			/* the file_info buf is endian converted by caller */
			pfile_info->AllocationSize =
				cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
			pfile_info->EndOfFile = pfile_info->AllocationSize;
			pfile_info->NumberOfLinks = cpu_to_le32(1);
			pfile_info->DeletePending = 0;
		}
	}

	cifs_buf_release(pSMB);
	if (rc == -EAGAIN)
		goto OldOpenRetry;
	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.