From: Jeff Layton jlayton@kernel.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@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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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;