shared: introduce cmsg_close_all() call

The call iterates through cmsg list and closes all fds passed via
SCM_RIGHTS.

This patch also ensures the call is used wherever appropriate, where we
might get spurious fds sent and we should better close them, then leave
them lying around.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/udev/udev-ctrl.c b/src/udev/udev-ctrl.c
index 7b5ef6b2a8..59a3eceaad 100644
--- a/src/udev/udev-ctrl.c
+++ b/src/udev/udev-ctrl.c
@@ -377,6 +377,9 @@ struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) {
                 log_error_errno(errno, "unable to receive ctrl message: %m");
                 goto err;
         }
+
+        cmsg_close_all(&smsg);
+
         cmsg = CMSG_FIRSTHDR(&smsg);
         cred = (struct ucred *) CMSG_DATA(cmsg);