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Sun, 8 Apr 2018 20:38:02 -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 4.4 120/162] kconfig: Don't leak main menus during parsing Thread-Topic: [PATCH AUTOSEL for 4.4 120/162] kconfig: Don't leak main menus during parsing Thread-Index: AQHTz5nLpef0xzqSkU6fpI7MrRxxNA== Date: Mon, 9 Apr 2018 00:29:18 +0000 Message-ID: <20180409002738.163941-120-alexander.levin@microsoft.com> References: <20180409002738.163941-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002738.163941-1-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;DM5PR2101MB1110;7:gmtt7YNEt4x594heTiy6TJpUr7mcDsKCLDJB8Elm6GwrYoUIVJ/w5inGWHarrse404tmEpA8DNZba0KwYxy/2APjFhWkR8APbslvME3pWTvDbvOYiVTkWz7Pbww2EYayzYZwiKa9CY/FuQxcw9eREvvaZTvCfgCa9Rbk4UlDZnhrt7Lr02SGjcXspSNxw4Du9NACaRSHK0NKMGLOQQLUTAM/yXAFnU5Cv9KLjS0ZZkLylU2bI89QKUM1LNUtK8YB;20:G8gf/0l8UPmWX7hVJlOLv1+W6NoWweFxTFH8EE+pyxQ0wpLqdE1SdIY5yLgjgbCp/Rk4K5Z3IiKT30EO+9nsL9AEQR0jRb5AHY2V1oEj9Mek2jO0VNGr9H+ASntoTNTLiBD+lp6m9uey4iv+K/whL6EBjUGcvueCQz14KPSFSLY= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: c5d4d4b0-3ef5-4115-6820-08d59db2256b x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1110; 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x-microsoft-antispam-message-info: EwDwLcLEivMf4LJFT5zUlD0dsokrt6qddvZSv5DEh6/tiq0tM0YpSB46qMFML6ZoL9KwTX7q7IaeVyeilEKbITjPBH74KapVXZloYz+XMFTroDUdyoIviOcu4QyNmV1prr4ee12/DE2bBMdsdHtDGdD0TrzTpA04PipgDu1z6+WIwpn9JTyRfJt9yRoSKt3r8tpWm4CxDiSVjAssJ+K/qU9BLBhgY7dVPJDLcIoy3U6vX8Tf6x8g+N1te0mtcuG5XXw7+VyVSi7KHS8EtdSyTN6cq69UONuFDxsk3Gs1Kpkg4OfLc63ydt0n7K6FdW3K4jmv7JvcGDeOgjyP+M6iSMHvsc5qL12hpvqgMoF9nDyVEEei7Eo++FCGz5BpyvfrGIl1cZL26STlkBJyZsE8cuZ4qhLQh51GPwePUitNsrQ= 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: c5d4d4b0-3ef5-4115-6820-08d59db2256b X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:29:18.2243 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1110 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