upstream: Check for and disallow MaxStartups values less than or

equal to zero during config parsing, rather than faling later at runtime.
bz#3489, ok djm@

OpenBSD-Commit-ID: d79c2b7a8601eb9be493629a91245d761154308b

servconf.c

@@ -1,5 +1,5 @@
 
-/* $OpenBSD: servconf.c,v 1.386 2022/09/17 10:34:29 djm Exp $ */
+/* $OpenBSD: servconf.c,v 1.387 2022/11/07 10:02:59 dtucker Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -1918,6 +1918,10 @@ process_server_config_line_depth(ServerOptions *options, char *line,
 			    filename, linenum, keyword);
 		else
 			options->max_startups = options->max_startups_begin;
+		if (options->max_startups <= 0 ||
+		    options->max_startups_begin <= 0)
+			fatal("%s line %d: Invalid %s spec.",
+			    filename, linenum, keyword);
 		break;
 
 	case sPerSourceNetBlockSize: