From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D62BC47088 for ; Wed, 30 Nov 2022 18:51:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231467AbiK3Svp (ORCPT ); Wed, 30 Nov 2022 13:51:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231523AbiK3Svg (ORCPT ); Wed, 30 Nov 2022 13:51:36 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6245B63D43 for ; Wed, 30 Nov 2022 10:51:35 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EFC3E61D59 for ; Wed, 30 Nov 2022 18:51:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0881DC433C1; Wed, 30 Nov 2022 18:51:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669834294; bh=nUZmhGt3oAptX1QO4ocpry3wQOSVe5Q+F1aUzH4oK2g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x69IiJN2OhPJToWlMKabyTXScrk/y90O2VuJH3kXL8DBbL8yXkozR6QSZcf5cVkJS /G5Dtr2WRzTjLd5UXG9IODuFlCD6FBbTlfO3UmyN9Z54/ic5tIfP/8oa8Mjq5Yvg7T lkspkwzKqHjlsTsPnrbaXA4MjtGCFSrs5kK7aXiA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chen Zhongjin , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 6.0 173/289] iio: core: Fix entry not deleted when iio_register_sw_trigger_type() fails Date: Wed, 30 Nov 2022 19:22:38 +0100 Message-Id: <20221130180548.052805896@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130180544.105550592@linuxfoundation.org> References: <20221130180544.105550592@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chen Zhongjin commit 4ad09d956f8eacff61e67e5b13ba8ebec3232f76 upstream. In iio_register_sw_trigger_type(), configfs_register_default_group() is possible to fail, but the entry add to iio_trigger_types_list is not deleted. This leaves wild in iio_trigger_types_list, which can cause page fault when module is loading again. So fix this by list_del(&t->list) in error path. BUG: unable to handle page fault for address: fffffbfff81d7400 Call Trace: iio_register_sw_trigger_type do_one_initcall do_init_module load_module ... Fixes: b662f809d410 ("iio: core: Introduce IIO software triggers") Signed-off-by: Chen Zhongjin Link: https://lore.kernel.org/r/20221108032802.168623-1-chenzhongjin@huawei.com Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-sw-trigger.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/iio/industrialio-sw-trigger.c +++ b/drivers/iio/industrialio-sw-trigger.c @@ -58,8 +58,12 @@ int iio_register_sw_trigger_type(struct t->group = configfs_register_default_group(iio_triggers_group, t->name, &iio_trigger_type_group_type); - if (IS_ERR(t->group)) + if (IS_ERR(t->group)) { + mutex_lock(&iio_trigger_types_lock); + list_del(&t->list); + mutex_unlock(&iio_trigger_types_lock); ret = PTR_ERR(t->group); + } return ret; }