cifs: fail i/o on soft mounts if sessionsetup errors out

commit b0dd940e582b6a60296b9847a54012a4b080dc72 upstream.

RHBZ: 1579050

If we have a soft mount we should fail commands for session-setup
failures (such as the password having changed/ account being deleted/ ...)
and return an error back to the application.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 84e60b3..d4472a4 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -250,9 +250,14 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
         */
        mutex_lock(&tcon->ses->session_mutex);
        rc = cifs_negotiate_protocol(0, tcon->ses);
-       if (!rc && tcon->ses->need_reconnect)
+       if (!rc && tcon->ses->need_reconnect) {
                rc = cifs_setup_session(0, tcon->ses, nls_codepage);
-
+               if ((rc == -EACCES) && !tcon->retry) {
+                       rc = -EHOSTDOWN;
+                       mutex_unlock(&tcon->ses->session_mutex);
+                       goto failed;
+               }
+       }
        if (rc || !tcon->need_reconnect) {
                mutex_unlock(&tcon->ses->session_mutex);
                goto out;
@@ -286,6 +291,7 @@ out:
        case SMB2_SET_INFO:
                rc = -EAGAIN;
        }
+failed:
        unload_nls(nls_codepage);
        return rc;
 }