--- evolution-1.0.5.orig/camel/camel-lock-helper.c	2001-10-27 18:59:27.000000000 +0200
+++ evolution-1.0.5/camel/camel-lock-helper.c	2005-01-21 16:57:44.000000000 +0100
@@ -360,6 +360,8 @@ int main(int argc, char **argv)
 			switch(msg.id) {
 			case CAMEL_LOCK_HELPER_LOCK:
 				res = CAMEL_LOCK_HELPER_STATUS_NOMEM;
+				if (msg.data+1 < msg.data)
+					break;
 				path = malloc(msg.data+1);
 				if (path != NULL) {
 					res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;