CIFSSMBGetCIFSACL(const int xid, struct cifs_tcon *tcon, __u16 fid,
		  struct cifs_ntsd **acl_inf, __u32 *pbuflen)
{
	int rc = 0;
	int buf_type = 0;
	QUERY_SEC_DESC_REQ *pSMB;
	struct kvec iov[1];

	cFYI(1, "GetCifsACL");

	*pbuflen = 0;
	*acl_inf = NULL;

	rc = smb_init_nttransact(NT_TRANSACT_QUERY_SECURITY_DESC, 0,
			8 /* parm len */, tcon, (void **) &pSMB);
	if (rc)
		return rc;

	pSMB->MaxParameterCount = cpu_to_le32(4);
	/* BB TEST with big acls that might need to be e.g. larger than 16K */
	pSMB->MaxSetupCount = 0;
	pSMB->Fid = fid; /* file handle always le */
	pSMB->AclFlags = cpu_to_le32(CIFS_ACL_OWNER | CIFS_ACL_GROUP |
				     CIFS_ACL_DACL);
	pSMB->ByteCount = cpu_to_le16(11); /* 3 bytes pad + 8 bytes parm */
	inc_rfc1001_len(pSMB, 11);
	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 iovec */, &buf_type,
			 0);
	cifs_stats_inc(&tcon->num_acl_get);
	if (rc) {
		cFYI(1, "Send error in QuerySecDesc = %d", rc);
	} else {                /* decode response */
		__le32 *parm;
		__u32 parm_len;
		__u32 acl_len;
		struct smb_com_ntransact_rsp *pSMBr;
		char *pdata;

/* validate_nttransact */
		rc = validate_ntransact(iov[0].iov_base, (char **)&parm,
					&pdata, &parm_len, pbuflen);
		if (rc)
			goto qsec_out;
		pSMBr = (struct smb_com_ntransact_rsp *)iov[0].iov_base;

		cFYI(1, "smb %p parm %p data %p", pSMBr, parm, *acl_inf);

		if (le32_to_cpu(pSMBr->ParameterCount) != 4) {
			rc = -EIO;      /* bad smb */
			*pbuflen = 0;
			goto qsec_out;
		}

/* BB check that data area is minimum length and as big as acl_len */

		acl_len = le32_to_cpu(*parm);
		if (acl_len != *pbuflen) {
			cERROR(1, "acl length %d does not match %d",
				   acl_len, *pbuflen);
			if (*pbuflen > acl_len)
				*pbuflen = acl_len;
		}

		/* check if buffer is big enough for the acl
		   header followed by the smallest SID */
		if ((*pbuflen < sizeof(struct cifs_ntsd) + 8) ||
		    (*pbuflen >= 64 * 1024)) {
			cERROR(1, "bad acl length %d", *pbuflen);
			rc = -EINVAL;
			*pbuflen = 0;
		} else {
			*acl_inf = kmalloc(*pbuflen, GFP_KERNEL);
			if (*acl_inf == NULL) {
				*pbuflen = 0;
				rc = -ENOMEM;
			}
			memcpy(*acl_inf, pdata, *pbuflen);
		}
	}
qsec_out:
	if (buf_type == CIFS_SMALL_BUFFER)
		cifs_small_buf_release(iov[0].iov_base);
	else if (buf_type == CIFS_LARGE_BUFFER)
		cifs_buf_release(iov[0].iov_base);
/*	cifs_small_buf_release(pSMB); */ /* Freed earlier now in SendReceive2 */
	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.