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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7FECC433EF for ; Mon, 15 Nov 2021 18:49:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99CBC635FD for ; Mon, 15 Nov 2021 18:49:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242845AbhKOSvm (ORCPT ); Mon, 15 Nov 2021 13:51:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:52898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242940AbhKOSsO (ORCPT ); Mon, 15 Nov 2021 13:48:14 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3FAD563396; Mon, 15 Nov 2021 18:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636999661; bh=OdPxKY2c7kAht3iiLXBnSutzuDh+aocw/PFPwt6d29o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NTij1s3bcfSGTZ898GOuDB8UpP/khdeswjgkPowQizSnjiqDj4pF4ZGhP/uT9KZSV tsdmfJP3PU2Cio3aGkiwO/FM9KUiVpFUKp++qL61DywCYKrGIMM4Y0AA1ty7eW6hSQ Gh3cu37RC+M3K3QKCKmU4gXtIZHuLt7J+aCH2yQA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , syzbot+a6969ef522a36d3344c9@syzkaller.appspotmail.com Subject: [PATCH 5.14 378/849] media: em28xx: add missing em28xx_close_extension Date: Mon, 15 Nov 2021 17:57:41 +0100 Message-Id: <20211115165433.029680560@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@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: stable@vger.kernel.org From: Pavel Skripkin [ Upstream commit 2c98b8a3458df03abdc6945bbef67ef91d181938 ] If em28xx dev has ->dev_next pointer, we need to delete ->dev_next list node from em28xx_extension_devlist on disconnect to avoid UAF bugs and corrupted list bugs, since driver frees this pointer on disconnect. Reported-and-tested-by: syzbot+a6969ef522a36d3344c9@syzkaller.appspotmail.com Fixes: 1a23f81b7dc3 ("V4L/DVB (9979): em28xx: move usb probe code to a proper place") Signed-off-by: Pavel Skripkin Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/em28xx/em28xx-cards.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index c1e0dccb74088..948e22e29b42a 100644 --- a/drivers/media/usb/em28xx/em28xx-cards.c +++ b/drivers/media/usb/em28xx/em28xx-cards.c @@ -4139,8 +4139,11 @@ static void em28xx_usb_disconnect(struct usb_interface *intf) em28xx_close_extension(dev); - if (dev->dev_next) + if (dev->dev_next) { + em28xx_close_extension(dev->dev_next); em28xx_release_resources(dev->dev_next); + } + em28xx_release_resources(dev); if (dev->dev_next) { -- 2.33.0