mon: Monitor: check for an argument to 'quorum' before reading the array

Fixes: #4218
Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>

diff --git a/src/mon/Monitor.cc b/src/mon/Monitor.cc
index d39491defaddcffcff381dfa09d9ed74362ec9aa..716eeabe63a40f0d3df062bd6de2a464861ac8a9 100644 (file)
--- a/src/mon/Monitor.cc
+++ b/src/mon/Monitor.cc
@@ -2616,6 +2616,11 @@ void Monitor::handle_command(MMonCommand *m)
       rs = "access denied";
       goto out;
     }
+    if (m->cmd.size() < 2) {
+      r = -EINVAL;
+      rs = "'quorum' requires an argument: 'exit' or 'enter'";
+      goto out;
+    }
     if (m->cmd[1] == "exit") {
       reset();
       start_election();