Index: test/test-config.51.in
===================================================================
--- test/test-config.51.in	(revision 0)
+++ test/test-config.51.in	(revision 432)
@@ -0,0 +1,8 @@
+/var/log/this_dir_does_not_exist/*log {
+    size 1
+    missingok
+    sharedscripts
+    prerotate
+    /usr/bin/some-program
+    endscript
+}
Index: test/test
===================================================================
--- test/test	(revision 431)
+++ test/test	(working copy)
@@ -4,7 +4,7 @@
 SELINUX_TESTS=0
 LOGROTATE=../logrotate
 M="-m ./mailer"
-S=-"s state"
+S="-s state"
 RLR="$LOGROTATE $M $S"
 
 # -- ACL - BEGIN --------------------------------
@@ -1284,7 +1284,40 @@
 echo "Does not have GNU Date, skipping part of this test"
 fi
 
+cleanup 51
 
+# ------------------------------- Test 51 ------------------------------------
+# regression in 3.8.4, logrotate crashes with sharedscripts when 0 logs rotated
+preptest test.log 51 1 0
 
+# It's memory corruption and without something in state file, it won't crash
+# reliably. It would be better to run valgrind here and check the errors, but
+# I don't want the test-suite to depend on valgrind...
+cat > state << EOF
+logrotate state -- version 2
+"/var/log/httpd/backend_error_log" 2013-6-16
+"/var/log/tokyotyrant/*.log" 2011-5-30
+"/var/log/mailman/digest" 2011-5-30
+"/var/log/piranha/piranha-gui-access" 2011-5-30
+"/var/log/boincerr.log" 2011-5-30
+"/var/log/btmp" 2013-7-9
+"/var/log/httpd/a_log" 2011-11-15
+"/var/log/cups/*_log" 2012-7-19
+"/var/log/rabbitmq/*.log" 2011-5-30
+"/var/log/func/func.log" 2011-11-17
+"/var/log/wtmp" 2013-7-9
+"/var/log/glusterfs/*glusterd.vol.log" 2011-11-17
+"/var/log/imapd.log" 2011-5-30
+"/var/log/cobbler/cobbler.log" 2011-11-6
+"/var/log/httpd/ssl_access_log" 2013-3-27
+"/var/log/mrepo.log" 2011-5-30
+EOF
 
+$RLR test-config.51
+
+if [ $? != 0 ]; then
+	echo "logrotate ended with non-zero exit code (probably crashed)"
+	exit 3
+fi
+
 cleanup
Index: logrotate.c
===================================================================
--- logrotate.c	(revision 431)
+++ logrotate.c	(working copy)
@@ -1601,6 +1601,11 @@
 	message(MESS_DEBUG, "old logs are removed\n");
     }
 
+	if (log->numFiles == 0) {
+		message(MESS_DEBUG, "No logs found. Rotation not needed.\n");
+		return 0;
+	}
+
 	if (log->flags & LOG_FLAG_SU) {
 		if (switch_user(log->suUid, log->suGid) != 0) {
 			return 1;
@@ -1657,7 +1662,6 @@
 	    hasErrors |= logHasErrors[i];
 	}
 
-	/* (nemam chyby nebo shared) a (nemam chyby nebo nonshared) */
 	if (log->pre
 	    && (!logHasErrors[j] || log->flags & LOG_FLAG_SHAREDSCRIPTS) &&
 		   ((!hasErrors && state[j]->doRotate) || (!(log->flags & LOG_FLAG_SHAREDSCRIPTS) && state[j]->doRotate) ) ) {
Index: CHANGES
===================================================================
--- CHANGES	(revision 431)
+++ CHANGES	(working copy)
@@ -1,3 +1,6 @@
+3.8.5 -> 
+	- Fixed memory corruption caused by rotation directory which does not
+	  exist with "sharedscripts" together with "prerotate" script.
 3.8.4 -> 3.8.5
 	- Improved rotation during daylight saving time and between timezone
 	  changes.