Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, "Yan, Zheng" , Sage Weil Subject: [ 164/171] ceph: Fix infinite loop in __wake_requests Date: Tue, 15 Jan 2013 14:45:29 -0800 Message-Id: <20130115224325.155970120@linuxfoundation.org> In-Reply-To: <20130115224313.394976595@linuxfoundation.org> References: <20130115224313.394976595@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Yan, Zheng" __wake_requests() will enter infinite loop if we use it to wake requests in the session->s_waiting list. __wake_requests() deletes requests from the list and __do_request() adds requests back to the list. Signed-off-by: Yan, Zheng Signed-off-by: Sage Weil (cherry picked from commit ed75ec2cd19b47efcd292b6e23f58e56f4c5bc34) Signed-off-by: Greg Kroah-Hartman --- fs/ceph/mds_client.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -1886,9 +1886,14 @@ finish: static void __wake_requests(struct ceph_mds_client *mdsc, struct list_head *head) { - struct ceph_mds_request *req, *nreq; + struct ceph_mds_request *req; + LIST_HEAD(tmp_list); - list_for_each_entry_safe(req, nreq, head, r_wait) { + list_splice_init(head, &tmp_list); + + while (!list_empty(&tmp_list)) { + req = list_entry(tmp_list.next, + struct ceph_mds_request, r_wait); list_del_init(&req->r_wait); __do_request(mdsc, req); }