From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933937Ab3AOXUW (ORCPT ); Tue, 15 Jan 2013 18:20:22 -0500 Received: from mail.kernel.org ([198.145.19.201]:47350 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933868Ab3AOWxf (ORCPT ); Tue, 15 Jan 2013 17:53:35 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Alex Elder Subject: [ 158/171] ceph: dont reference req after put Date: Tue, 15 Jan 2013 14:45:23 -0800 Message-Id: <20130115224324.735579554@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.336.g94702dd In-Reply-To: <20130115224313.394976595@linuxfoundation.org> References: <20130115224313.394976595@linuxfoundation.org> User-Agent: quilt/0.60-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Elder In __unregister_request(), there is a call to list_del_init() referencing a request that was the subject of a call to ceph_osdc_put_request() on the previous line. This is not safe, because the request structure could have been freed by the time we reach the list_del_init(). Fix this by reversing the order of these lines. Signed-off-by: Alex Elder Reviewed-off-by: Sage Weil (cherry picked from commit 7d5f24812bd182a2471cb69c1c2baf0648332e1f) Signed-off-by: Greg Kroah-Hartman --- net/ceph/osd_client.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -871,9 +871,9 @@ static void __unregister_request(struct req->r_osd = NULL; } + list_del_init(&req->r_req_lru_item); ceph_osdc_put_request(req); - list_del_init(&req->r_req_lru_item); if (osdc->num_requests == 0) { dout(" no requests, canceling timeout\n"); __cancel_osd_timeout(osdc);