ceph: don't try fill file_lock on unsuccessful GETFILELOCK reply
authorJeff Layton <jlayton@kernel.org>
Thu, 15 Aug 2019 10:23:38 +0000 (06:23 -0400)
committerIlya Dryomov <idryomov@gmail.com>
Thu, 22 Aug 2019 08:47:41 +0000 (10:47 +0200)
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@vger.kernel.org
Reported-by: Hector Martin <hector@marcansoft.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
fs/ceph/locks.c

index ac9b53b..5083e23 100644 (file)
@@ -111,8 +111,7 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct inode *inode,
                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;