Fix misc bad-syntax crashes, bug1532.

Changes

@@ -22,6 +22,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ****  Fix ugly error on interface misuse, bug1525. [Bogdan Vukobratovic]
 
+****  Fix misc bad-syntax crashes, bug1532. [Eric Rippey]
+
 
 * Verilator 4.018 2019-08-29
 

src/verilog.l

@@ -850,7 +850,8 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
 
   /************************************************************************/
   /* STRINGS */
-<STRING><<EOF>>         { FL_FWD; yyerrorf("EOF in unterminated string"); yyleng = 0; yy_pop_state(); FL_BRK; }
+<STRING><<EOF>>         { FL_FWD; yyerrorf("EOF in unterminated string");
+                          yyleng = 0; yy_pop_state(); FL_BRK; yyterminate(); }
 <STRING>{crnl}          { FL_FWD; yyerrorf("Unterminated string"); FL_BRK; }
 <STRING>\\{crnl}        { yymore(); }
 <STRING>\\.             { yymore(); }
@@ -867,7 +868,7 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
 <ATTRMODE>{word}        { yymore(); }
 <ATTRMODE>.             { yymore(); }
 <ATTRMODE><<EOF>>       { FL_FWD; yyerrorf("EOF in (*");
-			  yyleng = 0; yy_pop_state(); FL_BRK; }
+                          yyleng = 0; yy_pop_state(); FL_BRK; yyterminate(); }
 
   /************************************************************************/
   /* Attributes */
@@ -883,7 +884,8 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
 <TABLE>";"              { FL; yylval.strp = PARSEP->newString(yytext, yyleng); return yaTABLELINE; }
 <TABLE>"endtable"       { yy_pop_state(); FL; return yENDTABLE; }
 <TABLE>.                { yymore(); }
-<TABLE><<EOF>>          { FL_FWD; yyerrorf("EOF in TABLE"); yyleng = 0; yy_pop_state(); FL_BRK; }
+<TABLE><<EOF>>          { FL_FWD; yyerrorf("EOF in TABLE");
+                          yyleng = 0; yy_pop_state(); FL_BRK; yyterminate(); }
 
   /************************************************************************/
   /* Preprocessor */

test_regress/t/t_fuzz_eof_bad.pl

@@ -0,0 +1,17 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+
+scenarios(linter => 1);
+
+lint(
+    fails => 1,
+    );
+
+ok(1);
+1;

test_regress/t/t_fuzz_eof_bad.v

@@ -0,0 +1,3 @@
+module a;
+	initial $lay(*Hello!=n");
+endmodule