CIFSSMBQueryReparseLinkInfo(const int xid, struct cifs_tcon *tcon,
			const unsigned char *searchName,
			char *symlinkinfo, const int buflen, __u16 fid,
			const struct nls_table *nls_codepage)
{
	int rc = 0;
	int bytes_returned;
	struct smb_com_transaction_ioctl_req *pSMB;
	struct smb_com_transaction_ioctl_rsp *pSMBr;

	cFYI(1, "In Windows reparse style QueryLink for path %s", searchName);
	rc = smb_init(SMB_COM_NT_TRANSACT, 23, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	pSMB->TotalParameterCount = 0 ;
	pSMB->TotalDataCount = 0;
	pSMB->MaxParameterCount = cpu_to_le32(2);
	/* BB find exact data count max from sess structure BB */
	pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
					  MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
	pSMB->MaxSetupCount = 4;
	pSMB->Reserved = 0;
	pSMB->ParameterOffset = 0;
	pSMB->DataCount = 0;
	pSMB->DataOffset = 0;
	pSMB->SetupCount = 4;
	pSMB->SubCommand = cpu_to_le16(NT_TRANSACT_IOCTL);
	pSMB->ParameterCount = pSMB->TotalParameterCount;
	pSMB->FunctionCode = cpu_to_le32(FSCTL_GET_REPARSE_POINT);
	pSMB->IsFsctl = 1; /* FSCTL */
	pSMB->IsRootFlag = 0;
	pSMB->Fid = fid; /* file handle always le */
	pSMB->ByteCount = 0;

	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	if (rc) {
		cFYI(1, "Send error in QueryReparseLinkInfo = %d", rc);
	} else {		/* decode response */
		__u32 data_offset = le32_to_cpu(pSMBr->DataOffset);
		__u32 data_count = le32_to_cpu(pSMBr->DataCount);
		if (get_bcc(&pSMBr->hdr) < 2 || data_offset > 512) {
			/* BB also check enough total bytes returned */
			rc = -EIO;	/* bad smb */
			goto qreparse_out;
		}
		if (data_count && (data_count < 2048)) {
			char *end_of_smb = 2 /* sizeof byte count */ +
			       get_bcc(&pSMBr->hdr) + (char *)&pSMBr->ByteCount;

			struct reparse_data *reparse_buf =
						(struct reparse_data *)
						((char *)&pSMBr->hdr.Protocol
								 + data_offset);
			if ((char *)reparse_buf >= end_of_smb) {
				rc = -EIO;
				goto qreparse_out;
			}
			if ((reparse_buf->LinkNamesBuf +
				reparse_buf->TargetNameOffset +
				reparse_buf->TargetNameLen) > end_of_smb) {
				cFYI(1, "reparse buf beyond SMB");
				rc = -EIO;
				goto qreparse_out;
			}

			if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE) {
				cifs_from_ucs2(symlinkinfo, (__le16 *)
						(reparse_buf->LinkNamesBuf +
						reparse_buf->TargetNameOffset),
						buflen,
						reparse_buf->TargetNameLen,
						nls_codepage, 0);
			} else { /* ASCII names */
				strncpy(symlinkinfo,
					reparse_buf->LinkNamesBuf +
					reparse_buf->TargetNameOffset,
					min_t(const int, buflen,
					   reparse_buf->TargetNameLen));
			}
		} else {
			rc = -EIO;
			cFYI(1, "Invalid return data count on "
				 "get reparse info ioctl");
		}
		symlinkinfo[buflen] = 0; /* just in case so the caller
					does not go off the end of the buffer */
		cFYI(1, "readlink result - %s", symlinkinfo);
	}

qreparse_out:
	cifs_buf_release(pSMB);

	/* 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.