CIFSSMBOpen(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;
	OPEN_REQ *pSMB = NULL;
	OPEN_RSP *pSMBr = NULL;
	int bytes_returned;
	int name_len;
	__u16 count;

openRetry:
	rc = smb_init(SMB_COM_NT_CREATE_ANDX, 24, 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;
		pSMB->NameLength = cpu_to_le16(name_len);
	} else {		/* BB improve check for buffer overruns BB */
		count = 0;	/* no pad */
		name_len = strnlen(fileName, PATH_MAX);
		name_len++;	/* trailing null */
		pSMB->NameLength = cpu_to_le16(name_len);
		strncpy(pSMB->fileName, fileName, name_len);
	}
	if (*pOplock & REQ_OPLOCK)
		pSMB->OpenFlags = cpu_to_le32(REQ_OPLOCK);
	else if (*pOplock & REQ_BATCHOPLOCK)
		pSMB->OpenFlags = cpu_to_le32(REQ_BATCHOPLOCK);
	pSMB->DesiredAccess = cpu_to_le32(access_flags);
	pSMB->AllocationSize = 0;
	/* 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_le32(ATTR_SYSTEM);
	else
		pSMB->FileAttributes = cpu_to_le32(ATTR_NORMAL);

	/* XP does not handle ATTR_POSIX_SEMANTICS */
	/* but it helps speed up case sensitive checks for other
	servers such as Samba */
	if (tcon->ses->capabilities & CAP_UNIX)
		pSMB->FileAttributes |= cpu_to_le32(ATTR_POSIX_SEMANTICS);

	if (create_options & CREATE_OPTION_READONLY)
		pSMB->FileAttributes |= cpu_to_le32(ATTR_READONLY);

	pSMB->ShareAccess = cpu_to_le32(FILE_SHARE_ALL);
	pSMB->CreateDisposition = cpu_to_le32(openDisposition);
	pSMB->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
	/* BB Expirement with various impersonation levels and verify */
	pSMB->ImpersonationLevel = cpu_to_le32(SECURITY_IMPERSONATION);
	pSMB->SecurityFlags =
	    SECURITY_CONTEXT_TRACKING | SECURITY_EFFECTIVE_ONLY;

	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 {
		*pOplock = pSMBr->OplockLevel; /* 1 byte no need to le_to_cpu */
		*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? */
		if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
			*pOplock |= CIFS_CREATE_ACTION;
		if (pfile_info) {
			memcpy((char *)pfile_info, (char *)&pSMBr->CreationTime,
				36 /* CreationTime to Attributes */);
			/* the file_info buf is endian converted by caller */
			pfile_info->AllocationSize = pSMBr->AllocationSize;
			pfile_info->EndOfFile = pSMBr->EndOfFile;
			pfile_info->NumberOfLinks = cpu_to_le32(1);
			pfile_info->DeletePending = 0;
		}
	}

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