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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00648C433B4 for ; Mon, 17 May 2021 14:51:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9F5F6100B for ; Mon, 17 May 2021 14:51:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237464AbhEQOwW (ORCPT ); Mon, 17 May 2021 10:52:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:56730 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241296AbhEQOoW (ORCPT ); Mon, 17 May 2021 10:44:22 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D17F761955; Mon, 17 May 2021 14:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621261236; bh=XR2uOFFXND4OXxNyR95eOdKZs4Yb3E4Yj2In+6DR7Pc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J7HnSsPVdCMj4ZlKlE//rWGndx+IRJMh8353PXbf747LL1/ms2MJE1fxCZLNDZh1Q U2LjAfYB1d+Mh07XPQ7EuFBUKuFsbTtAg8rTpEAo1Xb/CfZJObNoT494KpEk19lwCM zL+Z8Li3M3jDVJsrOsKSKZAWixk3CatD/JqdjhCM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tomasz Duszynski , Alexandru Ardelean , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 5.12 323/363] iio: core: fix ioctl handlers removal Date: Mon, 17 May 2021 16:03:09 +0200 Message-Id: <20210517140313.519198043@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.508966430@linuxfoundation.org> References: <20210517140302.508966430@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tomasz Duszynski commit 901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a upstream. Currently ioctl handlers are removed twice. For the first time during iio_device_unregister() then later on inside iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask(). Double free leads to kernel panic. Fix this by not touching ioctl handlers list directly but rather letting code responsible for registration call the matching cleanup routine itself. Fixes: 8dedcc3eee3ac ("iio: core: centralize ioctl() calls to the main chardev") Signed-off-by: Tomasz Duszynski Acked-by: Alexandru Ardelean Cc: Link: https://lore.kernel.org/r/20210423080244.2790-1-tomasz.duszynski@octakon.com Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-core.c | 6 ------ 1 file changed, 6 deletions(-) --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1863,9 +1863,6 @@ EXPORT_SYMBOL(__iio_device_register); **/ void iio_device_unregister(struct iio_dev *indio_dev) { - struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); - struct iio_ioctl_handler *h, *t; - cdev_device_del(&indio_dev->chrdev, &indio_dev->dev); mutex_lock(&indio_dev->info_exist_lock); @@ -1876,9 +1873,6 @@ void iio_device_unregister(struct iio_de indio_dev->info = NULL; - list_for_each_entry_safe(h, t, &iio_dev_opaque->ioctl_handlers, entry) - list_del(&h->entry); - iio_device_wakeup_eventset(indio_dev); iio_buffer_wakeup_poll(indio_dev);