(mux_parse_string): Check for overflow when parsing the string length.

	Logout the current mux if the string length supplied is so
	large that it becomes a negative number.

src/server/mux-parse.c

 /*
- * $Id: mux-parse.c,v 0.16 1995/01/01 20:17:22 ceder Exp $
+ * $Id: mux-parse.c,v 0.17 1995/10/23 06:55:14 ceder Exp $
  * Copyright (C) 1991, 1993, 1994, 1995  Lysator Academic Computer Association.
  *
  * This file is part of the LysKOM server.
@@ -27,7 +27,7 @@
  * This is a hack. Clean this mess up with lacgen.
  */
 
-static char *rcsid = "$Id: mux-parse.c,v 0.16 1995/01/01 20:17:22 ceder Exp $";
+static char *rcsid = "$Id: mux-parse.c,v 0.17 1995/10/23 06:55:14 ceder Exp $";
 #include "rcs.h"
 USE(rcsid);
 
@@ -137,6 +137,12 @@ mux_parse_string(Mux	    *mux,
 	{
 	    longjmp(mux_parse_env, MUX_MSG_INCOMPLETE);
 	}
+
+	if (mux_len < 0)
+	{
+	    log("Insane string length from mux.  Logging out mux.\n");
+	    longjmp(mux_parse_env, MUX_LOGOUT);
+	}
 	
 	/* Check that
 	      a) there is a trailing H