linux-kernel - [PATCH 4.14 39/62] ceph: dont try fill file_lock on unsuccessful GETFILELOCK reply

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190827072702.894262572@linuxfoundation.org>
Date:   Tue, 27 Aug 2019 09:50:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hector Martin <hector@...cansoft.com>,
        Jeff Layton <jlayton@...nel.org>,
        "Yan, Zheng" <zyan@...hat.com>, Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 4.14 39/62] ceph: dont try fill file_lock on unsuccessful GETFILELOCK reply

From: Jeff Layton <jlayton@...nel.org>

commit 28a282616f56990547b9dcd5c6fbd2001344664c upstream.

When ceph_mdsc_do_request returns an error, we can't assume that the
filelock_reply pointer will be set. Only try to fetch fields out of
the r_reply_info when it returns success.

Cc: stable@...r.kernel.org
Reported-by: Hector Martin <hector@...cansoft.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: "Yan, Zheng" <zyan@...hat.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ceph/locks.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -78,8 +78,7 @@ static int ceph_lock_message(u8 lock_typ
 		req->r_wait_for_completion = ceph_lock_wait_for_completion;
 
 	err = ceph_mdsc_do_request(mdsc, inode, req);
-
-	if (operation == CEPH_MDS_OP_GETFILELOCK) {
+	if (!err && operation == CEPH_MDS_OP_GETFILELOCK) {
 		fl->fl_pid = -le64_to_cpu(req->r_reply_info.filelock_reply->pid);
 		if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
 			fl->fl_type = F_RDLCK;