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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Ulf Magnusson <ulfalizer@gmail.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.15 054/189] kconfig: Don't leak main menus
 during parsing
Thread-Topic: [PATCH AUTOSEL for 4.15 054/189] kconfig: Don't leak main menus
 during parsing
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Date:   Mon, 9 Apr 2018 00:17:28 +0000
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From: Ulf Magnusson <ulfalizer@gmail.com>

[ Upstream commit 0724a7c32a54e3e50d28e19e30c59014f61d4e2c ]

If a 'mainmenu' entry appeared in the Kconfig files, two things would
leak:

	- The 'struct property' allocated for the default "Linux Kernel
	  Configuration" prompt.

	- The string for the T_WORD/T_WORD_QUOTE prompt after the
	  T_MAINMENU token, allocated on the heap in zconf.l.

To fix it, introduce a new 'no_mainmenu_stmt' nonterminal that matches
if there's no 'mainmenu' and adds the default prompt. That means the
prompt only gets allocated once regardless of whether there's a
'mainmenu' statement or not, and managing it becomes simple.

Summary from Valgrind on 'menuconfig' (ARCH=3Dx86) before the fix:

	LEAK SUMMARY:
	   definitely lost: 344,568 bytes in 14,352 blocks
	   ...

Summary after the fix:

	LEAK SUMMARY:
	   definitely lost: 344,440 bytes in 14,350 blocks
	   ...

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 scripts/kconfig/zconf.y | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index c8f396c3b190..20d9caa4be99 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -108,7 +108,27 @@ static struct menu *current_menu, *current_entry;
 %%
 input: nl start | start;
=20
-start: mainmenu_stmt stmt_list | stmt_list;
+start: mainmenu_stmt stmt_list | no_mainmenu_stmt stmt_list;
+
+/* mainmenu entry */
+
+mainmenu_stmt: T_MAINMENU prompt nl
+{
+	menu_add_prompt(P_MENU, $2, NULL);
+};
+
+/* Default main menu, if there's no mainmenu entry */
+
+no_mainmenu_stmt: /* empty */
+{
+	/*
+	 * Hack: Keep the main menu title on the heap so we can safely free it
+	 * later regardless of whether it comes from the 'prompt' in
+	 * mainmenu_stmt or here
+	 */
+	menu_add_prompt(P_MENU, strdup("Linux Kernel Configuration"), NULL);
+};
+
=20
 stmt_list:
 	  /* empty */
@@ -351,13 +371,6 @@ if_block:
 	| if_block choice_stmt
 ;
=20
-/* mainmenu entry */
-
-mainmenu_stmt: T_MAINMENU prompt nl
-{
-	menu_add_prompt(P_MENU, $2, NULL);
-};
-
 /* menu entry */
=20
 menu: T_MENU prompt T_EOL
@@ -502,6 +515,7 @@ word_opt: /* empty */			{ $$ =3D NULL; }
=20
 void conf_parse(const char *name)
 {
+	const char *tmp;
 	struct symbol *sym;
 	int i;
=20
@@ -509,7 +523,6 @@ void conf_parse(const char *name)
=20
 	sym_init();
 	_menu_init();
-	rootmenu.prompt =3D menu_add_prompt(P_MENU, "Linux Kernel Configuration",=
 NULL);
=20
 	if (getenv("ZCONF_DEBUG"))
 		zconfdebug =3D 1;
@@ -519,8 +532,10 @@ void conf_parse(const char *name)
 	if (!modules_sym)
 		modules_sym =3D sym_find( "n" );
=20
+	tmp =3D rootmenu.prompt->text;
 	rootmenu.prompt->text =3D _(rootmenu.prompt->text);
 	rootmenu.prompt->text =3D sym_expand_string_value(rootmenu.prompt->text);
+	free((char*)tmp);
=20
 	menu_finalize(&rootmenu);
 	for_all_symbols(i, sym) {
--=20
2.15.1