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Sun, 8 Apr 2018 20:33:07 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Ulf Magnusson , Masahiro Yamada , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 232/293] kconfig: Don't leak main menus during parsing Thread-Topic: [PATCH AUTOSEL for 4.9 232/293] kconfig: Don't leak main menus during parsing Thread-Index: AQHTz5lSoiTSnGggg0CmRfIGzPXa4Q== Date: Mon, 9 Apr 2018 00:25:54 +0000 Message-ID: <20180409002239.163177-232-alexander.levin@microsoft.com> References: <20180409002239.163177-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002239.163177-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0902;7:T4YFrR1wn4wu+5+ClPop1qiie0ZRhWDKIFVwPeHZlJlDTqzNoc0S9R7ti9TlfxqDprivAK+iHIdg2PH8ExyYBMlYt/fSRpP64bbVsD61P+YRLeaQgiQsBfi+sobhCCC62gKmxMBcWzEwJtsYtouNOTyL2bXDWT6J5/EtVlQ8TVD6kYgr5IDGqu3s5oqcrO5TQxgvb1ikdY0HqHv8zM2Lerdnem1cku5BGoQeaCcJdCXGXEV+JTA2EdODNsSk7aCf;20:LiQ0M0L7pGpC18Vv1Cn1mreWXfaOjWMx5hcysUfq00R1Bt9LwPI8qWlTTOgX9/aLMXfKzJt9oPadT1fPXjlYOq2FFlyUdDq85Fv7D8iF/vtwwxR94eXfme/yXAD552ghfrJ5wD69e+P4MBBLmRYGZEOwTAwZQ0AnlW6DXAjaKoY= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 6d2bd57f-2922-4aa1-e788-08d59db175d4 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0902; 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x-microsoft-antispam-message-info: SaFd+aLRUoFoY7G4OwMrgm3YkSXnvY0YvQDj2+/uEq8H473nBL23ZYKZmEuzPlpyXhwCML/OjRNLwICdQvunf3FJFfIsOZZROReT+cwT2IcVVSBdP+DhRej0F+c0K74AZhqUG6Y14C1XPlm6WZsHX5o8vmW7K4gKvoiUrqRzkvq22qAtWVXde3lSyajKO22SMFOiK+A9NU35I6L3etG7GxQuprRWoSJH/G6117N0/Cxdx6Ygu4Do0ZpHaCBYJuIhGovBui31VyUKRP033abrS4/tRolbHk+56v+k5HCbZUCtI3CB7NTov/PmUr8jHov5UsA0+fn8tqrvm61TFziNnmKTJdU0Kmo0/pu5pK2PXeJ4gV263R4/NDj3rg900jNqsim+3DAQVUmtmF1oCoeZscP2seFz08QxjSso77TyQiA= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6d2bd57f-2922-4aa1-e788-08d59db175d4 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:25:54.7848 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0902 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Ulf Magnusson [ 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 Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- 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 71bf8bff696a..5122ed2d839a 100644 --- a/scripts/kconfig/zconf.y +++ b/scripts/kconfig/zconf.y @@ -107,7 +107,27 @@ 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 */ @@ -344,13 +364,6 @@ 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 @@ -495,6 +508,7 @@ word_opt: /* empty */ { $$ =3D NULL; } =20 void conf_parse(const char *name) { + const char *tmp; struct symbol *sym; int i; =20 @@ -502,7 +516,6 @@ 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; @@ -512,8 +525,10 @@ 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