From patchwork Tue Sep 8 15:26:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 309988 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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,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 E1A7AC43461 for ; Tue, 8 Sep 2020 18:31:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A88BA2098B for ; Tue, 8 Sep 2020 18:31:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599589905; bh=a/0utpbekIn7tOkcbHZ+dGokUhYv1MTxnUVOIa07WYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=smWBYC+0Lw+0jMvBlrHxrpiykgB2UHZJbw7bfGWtZP/0ixvcr7bCikkDoSqcK1dXg RSBC2PFd2m1czW7konsE7MsSgtMLADQ9qGc8jbgZRPDinBHC4mcnnFD4LbRxilEEb+ LTnNudjWWDY53mYUT5pqoOGBuEi5kq7dZ597oiaA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731639AbgIHSav (ORCPT ); Tue, 8 Sep 2020 14:30:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:53448 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731380AbgIHQJh (ORCPT ); Tue, 8 Sep 2020 12:09:37 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B88222463F; Tue, 8 Sep 2020 15:50:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599580204; bh=a/0utpbekIn7tOkcbHZ+dGokUhYv1MTxnUVOIa07WYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MDuLThEmcaJCNV2nfeS9utpwA3AaokpCkl5mW/pBCqblqsojxP54ywIVTisdTK37o CzyWOuhzTq8M/ZyHv3d88G8prPsp8TSTwmNsBUYBFwEZv40rJuNbR/qdE1Y0oDesiT 4jzkKfGD765NFTLxmXBjp8Xt9+xDS/TY3jNEnQY0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sean Young , Mauro Carvalho Chehab Subject: [PATCH 4.19 71/88] media: rc: do not access device via sysfs after rc_unregister_device() Date: Tue, 8 Sep 2020 17:26:12 +0200 Message-Id: <20200908152224.731943085@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908152221.082184905@linuxfoundation.org> References: <20200908152221.082184905@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Sean Young commit a2e2d73fa28136598e84db9d021091f1b98cbb1a upstream. Device drivers do not expect to have change_protocol or wakeup re-programming to be accesed after rc_unregister_device(). This can cause the device driver to access deallocated resources. Cc: # 4.16+ Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/rc/rc-main.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1245,6 +1245,10 @@ static ssize_t store_protocols(struct de } mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } old_protocols = *current_protocols; new_protocols = old_protocols; @@ -1383,6 +1387,10 @@ static ssize_t store_filter(struct devic return -EINVAL; mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } new_filter = *filter; if (fattr->mask) @@ -1497,6 +1505,10 @@ static ssize_t store_wakeup_protocols(st int i; mutex_lock(&dev->lock); + if (!dev->registered) { + mutex_unlock(&dev->lock); + return -ENODEV; + } allowed = dev->allowed_wakeup_protocols;