systemd: memory leak in journald-server.c introduced by fix for CVE-2018-16864

A memory leak was discovered in the backport of fixes for CVE-2018-16864 in Red Hat Enterprise Linux. Function dispatchmessagereal in journald-server.c does not free the memory allocated by setiovecfieldfree to store the CMDLINE= entry. A local attacker may use this flaw to make systemd-journald...