From patchwork Mon Jul 12 06:08:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 476351 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14D64C07E9B for ; Mon, 12 Jul 2021 06:20:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F33A46113E for ; Mon, 12 Jul 2021 06:20:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233712AbhGLGXa (ORCPT ); Mon, 12 Jul 2021 02:23:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:41280 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234395AbhGLGWc (ORCPT ); Mon, 12 Jul 2021 02:22:32 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7B4176113A; Mon, 12 Jul 2021 06:19:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626070769; bh=lSfJF6GAWok9ndKgaHe/W5GtGfCcKUVUStrb5YyW1GE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UIbyGa2ElLGt/pcSQ4FM0I6HbIPO6CQzaW3Rr6zmVSRzH7s9aJeWzAEYgkbbx7405 zXzxQoaRlHXSLxqIlHJ3SVEtxtB1YtW7mwP0I3afD6BfiocBjqXRD132589r2iRAqM HQjk5RTIdePfXUoy+VbmWXfl4P1v9Qf2lx1zirmM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Steve French , Sasha Levin Subject: [PATCH 5.4 133/348] cifs: fix missing spinlock around update to ses->status Date: Mon, 12 Jul 2021 08:08:37 +0200 Message-Id: <20210712060718.921117721@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060659.886176320@linuxfoundation.org> References: <20210712060659.886176320@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Steve French [ Upstream commit 0060a4f28a9ef45ae8163c0805e944a2b1546762 ] In the other places where we update ses->status we protect the updates via GlobalMid_Lock. So to be consistent add the same locking around it in cifs_put_smb_ses where it was missing. Addresses-Coverity: 1268904 ("Data race condition") Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/cifsglob.h | 3 ++- fs/cifs/connect.c | 5 ++++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index b16c994414ab..9c0e348cb00f 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -964,7 +964,7 @@ struct cifs_ses { struct mutex session_mutex; struct TCP_Server_Info *server; /* pointer to server info */ int ses_count; /* reference counter */ - enum statusEnum status; + enum statusEnum status; /* updates protected by GlobalMid_Lock */ unsigned overrideSecFlg; /* if non-zero override global sec flags */ char *serverOS; /* name of operating system underlying server */ char *serverNOS; /* name of network operating system of server */ @@ -1814,6 +1814,7 @@ require use of the stronger protocol */ * list operations on pending_mid_q and oplockQ * updates to XID counters, multiplex id and SMB sequence numbers * list operations on global DnotifyReqList + * updates to ses->status * tcp_ses_lock protects: * list operations on tcp and SMB session lists * tcon->open_file_lock protects the list of open files hanging off the tcon diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index ab9eeb5ff8e5..da0720f41ebc 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3049,9 +3049,12 @@ void cifs_put_smb_ses(struct cifs_ses *ses) spin_unlock(&cifs_tcp_ses_lock); return; } + spin_unlock(&cifs_tcp_ses_lock); + + spin_lock(&GlobalMid_Lock); if (ses->status == CifsGood) ses->status = CifsExiting; - spin_unlock(&cifs_tcp_ses_lock); + spin_unlock(&GlobalMid_Lock); cifs_free_ipc(ses);