[src/trunk]: src/usr.bin/xlint/lint1 lint: fix assertion after malformed for ...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4747b77c3c37
branches:  trunk
changeset: 984046:4747b77c3c37
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Jun 19 19:59:01 2021 +0000

description:
lint: fix assertion after malformed for loop

Found using afl.

diffstat:

 distrib/sets/lists/tests/mi                |   4 +++-
 tests/usr.bin/xlint/lint1/Makefile         |   4 +++-
 tests/usr.bin/xlint/lint1/stmt_for.c       |  16 ++++++++++++++++
 tests/usr.bin/xlint/lint1/stmt_for.exp     |   2 ++
 tests/usr.bin/xlint/lint1/t_integration.sh |   3 ++-
 usr.bin/xlint/lint1/func.c                 |   8 ++++++--
 6 files changed, 32 insertions(+), 5 deletions(-)

diffs (108 lines):

diff -r ba796cb54354 -r 4747b77c3c37 distrib/sets/lists/tests/mi
--- a/distrib/sets/lists/tests/mi       Sat Jun 19 19:49:15 2021 +0000
+++ b/distrib/sets/lists/tests/mi       Sat Jun 19 19:59:01 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.1060 2021/06/19 19:49:15 rillig Exp $
+# $NetBSD: mi,v 1.1061 2021/06/19 19:59:01 rillig Exp $
 #
 # Note: don't delete entries from here - mark them as "obsolete" instead.
 #
@@ -6919,6 +6919,8 @@
 ./usr/tests/usr.bin/xlint/lint1/msg_344.exp                    tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/op_colon.c                     tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/op_colon.exp                   tests-usr.bin-tests     compattestfile,atf
+./usr/tests/usr.bin/xlint/lint1/stmt_for.c                     tests-usr.bin-tests     compattestfile,atf
+./usr/tests/usr.bin/xlint/lint1/stmt_for.exp                   tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/t_integration                  tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/ztest                              tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/ztest/Atffile                      tests-usr.bin-tests     compattestfile,atf
diff -r ba796cb54354 -r 4747b77c3c37 tests/usr.bin/xlint/lint1/Makefile
--- a/tests/usr.bin/xlint/lint1/Makefile        Sat Jun 19 19:49:15 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/Makefile        Sat Jun 19 19:59:01 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.62 2021/06/19 19:49:15 rillig Exp $
+# $NetBSD: Makefile,v 1.63 2021/06/19 19:59:02 rillig Exp $
 
 NOMAN=         # defined
 MAX_MESSAGE=   344             # see lint1/err.c
@@ -134,6 +134,8 @@
 FILES+=                ${:U0 ${:U:${:Urange=${MAX_MESSAGE}}}:C,^.$,0&,:C,^..$,0&,:@i@msg_${i}.c msg_${i}.exp@:Nmsg_176.exp}
 FILES+=                op_colon.c
 FILES+=                op_colon.exp
+FILES+=                stmt_for.c
+FILES+=                stmt_for.exp
 
 # ----- begin hack -----
 # Prevent that ${DESTDIR}/emit.ln gets ${DESTDIR}/emit.c as implicit source.
diff -r ba796cb54354 -r 4747b77c3c37 tests/usr.bin/xlint/lint1/stmt_for.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/usr.bin/xlint/lint1/stmt_for.c      Sat Jun 19 19:59:01 2021 +0000
@@ -0,0 +1,16 @@
+/*     $NetBSD: stmt_for.c,v 1.1 2021/06/19 19:59:02 rillig Exp $      */
+# 3 "stmt_for.c"
+
+/*
+ * Before func.c 1.111 from 2021-06-19, lint ran into an assertion failure:
+ *
+ * "dcs->d_next == NULL" failed in funcend at func.c:422
+ */
+
+void
+test(void)
+{
+       for (0 0;               /* expect: syntax error '0' */
+}
+
+/* expect+1: cannot recover from previous errors */
diff -r ba796cb54354 -r 4747b77c3c37 tests/usr.bin/xlint/lint1/stmt_for.exp
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/usr.bin/xlint/lint1/stmt_for.exp    Sat Jun 19 19:59:01 2021 +0000
@@ -0,0 +1,2 @@
+stmt_for.c(13): error: syntax error '0' [249]
+stmt_for.c(17): error: cannot recover from previous errors [224]
diff -r ba796cb54354 -r 4747b77c3c37 tests/usr.bin/xlint/lint1/t_integration.sh
--- a/tests/usr.bin/xlint/lint1/t_integration.sh        Sat Jun 19 19:49:15 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/t_integration.sh        Sat Jun 19 19:59:01 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: t_integration.sh,v 1.54 2021/06/19 19:49:15 rillig Exp $
+# $NetBSD: t_integration.sh,v 1.55 2021/06/19 19:59:02 rillig Exp $
 #
 # Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -182,6 +182,7 @@
 test_case lex_wide_char
 test_case lex_wide_string
 test_case op_colon
+test_case stmt_for
 
 all_messages_body()
 {
diff -r ba796cb54354 -r 4747b77c3c37 usr.bin/xlint/lint1/func.c
--- a/usr.bin/xlint/lint1/func.c        Sat Jun 19 19:49:15 2021 +0000
+++ b/usr.bin/xlint/lint1/func.c        Sat Jun 19 19:59:01 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: func.c,v 1.110 2021/06/19 16:05:07 rillig Exp $        */
+/*     $NetBSD: func.c,v 1.111 2021/06/19 19:59:02 rillig Exp $        */
 
 /*
  * Copyright (c) 1994, 1995 Jochen Pohl
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: func.c,v 1.110 2021/06/19 16:05:07 rillig Exp $");
+__RCSID("$NetBSD: func.c,v 1.111 2021/06/19 19:59:02 rillig Exp $");
 #endif
 
 #include <stdlib.h>
@@ -415,6 +415,10 @@
                    dcs->d_func_args);
        }
 
+       /* clean up after syntax errors, see test stmt_for.c. */
+       while (dcs->d_next != NULL)
+               dcs = dcs->d_next;
+
        /*
         * remove all symbols declared during argument declaration from
         * the symbol table