From patchwork Wed Sep 14 02:17:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Xiaoxu X-Patchwork-Id: 12975445 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 BFFA9C6FA8B for ; Wed, 14 Sep 2022 01:16:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229531AbiINBQ6 (ORCPT ); Tue, 13 Sep 2022 21:16:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229638AbiINBQ4 (ORCPT ); Tue, 13 Sep 2022 21:16:56 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 653DA61D40 for ; Tue, 13 Sep 2022 18:16:55 -0700 (PDT) Received: from dggpeml500023.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4MS2Q02636zlVk4; Wed, 14 Sep 2022 09:12:56 +0800 (CST) Received: from localhost.localdomain (10.175.101.6) by dggpeml500023.china.huawei.com (7.185.36.114) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 14 Sep 2022 09:16:53 +0800 From: Zhang Xiaoxu To: , , , , , , , , , , Subject: [PATCH v6 3/5] ksmbd: Fix FSCTL_VALIDATE_NEGOTIATE_INFO message length check in smb2_ioctl() Date: Wed, 14 Sep 2022 10:17:39 +0800 Message-ID: <20220914021741.2672982-4-zhangxiaoxu5@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220914021741.2672982-1-zhangxiaoxu5@huawei.com> References: <20220914021741.2672982-1-zhangxiaoxu5@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpeml500023.china.huawei.com (7.185.36.114) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org The structure size includes 4 dialect slots, but the protocol does not require the client to send all 4. So this allows the negotiation to not fail. Fixes: c7803b05f74b ("smb3: fix ksmbd bigendian bug in oplock break, and move its struct to smbfs_common") Signed-off-by: Zhang Xiaoxu Cc: Reviewed-by: Tom Talpey --- fs/ksmbd/smb2pdu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index b56d7688ccf1..09ae601e64f9 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -7640,7 +7640,8 @@ int smb2_ioctl(struct ksmbd_work *work) goto out; } - if (in_buf_len < sizeof(struct validate_negotiate_info_req)) { + if (in_buf_len < offsetof(struct validate_negotiate_info_req, + Dialects)) { ret = -EINVAL; goto out; }