Fix segfault when invalid command issued.

First check if we actually find an entry inside the action map before
working on it further.

1 files changed, 3 insertions, 0 deletions

diff --git a/ponymix.cc b/ponymix.cc
index 5da741e..de3eebb 100644
--- a/ponymix.cc
+++ b/ponymix.cc
@@ -456,6 +456,9 @@ static const std::pair<const string, const Command>& string_to_command(
   };
 
   const auto match = actionmap.lower_bound(str);
+  if (match == actionmap.end()) {
+    errx(1, "error: Invalid action specified: %s", str);
+  }
 
   // Check for exact match
   if (match->first == str) {