Invalid timestamps on files caused mc to segfault by passing a null
  pointer to strftime. Avoid trying to print the time in this case.

  Reported by Maxim Britov <maxim@office.modum.by>
  at http://bugs.gentoo.org/184296

--- mc-4.6.1/src/util.c
+++ mc-4.6.1/src/util.c
@@ -717,6 +717,7 @@
     static size_t i18n_timelength = 0;
     static const char *fmtyear, *fmttime;
     const char *fmt;
+    struct tm *whentm;
 
     if (i18n_timelength == 0){
 	i18n_timelength = i18n_checktimelength() + 1;
@@ -740,7 +741,11 @@
     else
 	fmt = fmttime;
     
-    strftime (timebuf, sizeof (timebuf) - 1, fmt, localtime(&when));
+    whentm = localtime(&when);
+    if (whentm == NULL)
+	return "(invalid)";
+
+    strftime (timebuf, sizeof (timebuf) - 1, fmt, whentm);
     return timebuf;
 }