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SMB3: Validate negotiate request must always be signed

According to MS-SMB2 3.2.55 validate_negotiate request must
always be signed. Some Windows can fail the request if you send it unsigned

See kernel bugzilla bug 197311

CC: Stable <stable@vger.kernel.org>
Acked-by: Ronnie Sahlberg <lsahlber.redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

Steve French 4587eee0 a2d9daad

+3
unified split
+3
fs/cifs/smb2pdu.c
··· 1979 } else 1980 iov[0].iov_len = get_rfc1002_length(req) + 4; 1981 1982 1983 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov); 1984 cifs_small_buf_release(req);
··· 1979 } else 1980 iov[0].iov_len = get_rfc1002_length(req) + 4; 1981 1982 + /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ 1983 + if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) 1984 + req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED; 1985 1986 rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov); 1987 cifs_small_buf_release(req);