linux-kernel - [PATCH 4.19 74/93] CIFS: avoid using MID 0xFFFF

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Date:   Sun, 27 Oct 2019 22:01:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Roberto Bergantinos Corpas <rbergant@...hat.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Aurelien Aptel <aaptel@...e.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 4.19 74/93] CIFS: avoid using MID 0xFFFF

From: Roberto Bergantinos Corpas <rbergant@...hat.com>

commit 03d9a9fe3f3aec508e485dd3dcfa1e99933b4bdb upstream.

According to MS-CIFS specification MID 0xFFFF should not be used by the
CIFS client, but we actually do. Besides, this has proven to cause races
leading to oops between SendReceive2/cifs_demultiplex_thread. On SMB1,
MID is a 2 byte value easy to reach in CurrentMid which may conflict with
an oplock break notification request coming from server

Signed-off-by: Roberto Bergantinos Corpas <rbergant@...hat.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb1ops.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -183,6 +183,9 @@ cifs_get_next_mid(struct TCP_Server_Info
 	/* we do not want to loop forever */
 	last_mid = cur_mid;
 	cur_mid++;
+	/* avoid 0xFFFF MID */
+	if (cur_mid == 0xffff)
+		cur_mid++;
 
 	/*
 	 * This nested loop looks more expensive than it is.