From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE8CAC761AF for ; Mon, 3 Apr 2023 14:33:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233522AbjDCOdj (ORCPT ); Mon, 3 Apr 2023 10:33:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233615AbjDCOda (ORCPT ); Mon, 3 Apr 2023 10:33:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B855CCC1B for ; Mon, 3 Apr 2023 07:33:19 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1520861B41 for ; Mon, 3 Apr 2023 14:33:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 29A17C433EF; Mon, 3 Apr 2023 14:33:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680532398; bh=2HnkMK+6+8F4sG73bK5zwXhszATQOJJP/fQBYmjmR54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dIHFBGEGHa/4pmIuH0a17I3THeA9qDcTL76NjO1v6QTwDlUvl8YFKtGdl2tx0j7Z2 Xvx28BVm+uKGmYN9V4D41Mt+l9At0Tjng6/OLVm5Z1991F4I2XhNampHa0bOWt/p8o fLyqkG9GkhhEw/5BuYdGtD5HeTE4GBrjJD2yA8mI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Paulo Alcantara (SUSE)" , Ronnie Sahlberg , Steve French Subject: [PATCH 5.15 67/99] cifs: prevent infinite recursion in CIFSGetDFSRefer() Date: Mon, 3 Apr 2023 16:09:30 +0200 Message-Id: <20230403140405.994461103@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140356.079638751@linuxfoundation.org> References: <20230403140356.079638751@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Paulo Alcantara commit 09ba47b44d26b475bbdf9c80db9e0193d2b58956 upstream. We can't call smb_init() in CIFSGetDFSRefer() as cifs_reconnect_tcon() may end up calling CIFSGetDFSRefer() again to get new DFS referrals and thus causing an infinite recursion. Signed-off-by: Paulo Alcantara (SUSE) Reviewed-by: Ronnie Sahlberg Cc: stable@vger.kernel.org # 6.2 Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/cifssmb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -4751,8 +4751,13 @@ CIFSGetDFSRefer(const unsigned int xid, return -ENODEV; getDFSRetry: - rc = smb_init(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, (void **) &pSMB, - (void **) &pSMBr); + /* + * Use smb_init_no_reconnect() instead of smb_init() as + * CIFSGetDFSRefer() may be called from cifs_reconnect_tcon() and thus + * causing an infinite recursion. + */ + rc = smb_init_no_reconnect(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, + (void **)&pSMB, (void **)&pSMBr); if (rc) return rc;