Return-Path: Received: from mail.kernel.org ([198.145.29.99]:50974 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730430AbeLFOqN (ORCPT ); Thu, 6 Dec 2018 09:46:13 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ilya Dryomov , Sage Weil , Ben Hutchings Subject: [PATCH 4.9 057/101] libceph: check authorizer reply/challenge length before reading Date: Thu, 6 Dec 2018 15:38:56 +0100 Message-Id: <20181206143014.880913448@linuxfoundation.org> In-Reply-To: <20181206143011.174892052@linuxfoundation.org> References: <20181206143011.174892052@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ilya Dryomov commit 130f52f2b203aa0aec179341916ffb2e905f3afd upstream. Avoid scribbling over memory if the received reply/challenge is larger than the buffer supplied with the authorizer. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- net/ceph/messenger.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -1738,6 +1738,13 @@ static int read_partial_connect(struct c if (con->auth) { size = le32_to_cpu(con->in_reply.authorizer_len); + if (size > con->auth->authorizer_reply_buf_len) { + pr_err("authorizer reply too big: %d > %zu\n", size, + con->auth->authorizer_reply_buf_len); + ret = -EINVAL; + goto out; + } + end += size; ret = read_partial(con, end, size, con->auth->authorizer_reply_buf);