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[209.132.180.67]) by mx.google.com with ESMTP id t12si3383718otq.53.2020.01.24.12.43.06; Fri, 24 Jan 2020 12:43:18 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2019-08-05 header.b=OUxPmpHW; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390143AbgAXOLg (ORCPT + 99 others); Fri, 24 Jan 2020 09:11:36 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:54850 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389118AbgAXOLf (ORCPT ); Fri, 24 Jan 2020 09:11:35 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00OE8RCK065931; Fri, 24 Jan 2020 14:11:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2019-08-05; bh=VfNjqg7FejUrmLZJcuFSOF82y9tdMchXxATYFjEy1q4=; b=OUxPmpHW4++e/oZ8ICTiksfYm56LaT6jP9XajNEy3rgWIjLtwVyfBFVnCDm3fVSA6sTR tbhAa1L2H1vKy1rlDiBoFhK8CYJElQQA/mCKjrHTYCrZjJR+GMeBfeZPQL/0ktFYtwid MSBJLObZITMGk61zg5DSXzW0ixfjjBsBxYrPpS9x2kXii+kyD2VuzKT3e65QvmhL6PuC A3bKJNbmqZgWM0aefaE6RuXj9qXF1xyVBbYg/S6tVcGQB0rzJlKR5HUbNcF8W5eVc6ZL Zc6L7HyEXlZzF+ZT0TXBuN7x6V3bNYzh4BV2RrDSqlgzTz/6A37GFUqYnfd9t8QzWbQN lg== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by userp2130.oracle.com with ESMTP id 2xksev1ady-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 Jan 2020 14:11:12 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00OE9ACV011506; Fri, 24 Jan 2020 14:11:12 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3020.oracle.com with ESMTP id 2xqmwfbgrs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 Jan 2020 14:11:11 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 00OEB72Z000365; Fri, 24 Jan 2020 14:11:08 GMT Received: from kadam (/129.205.23.165) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 24 Jan 2020 06:11:07 -0800 Date: Fri, 24 Jan 2020 17:10:58 +0300 From: Dan Carpenter To: Hillf Danton Cc: syzbot , andreyknvl@google.com, bnvandana@gmail.com, hverkuil-cisco@xs4all.nl, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: KASAN: use-after-free Read in v4l2_release (3) Message-ID: <20200124141058.GM1847@kadam> References: <000000000000de50d7059ba6acd5@google.com> <20200123102707.2596-1-hdanton@sina.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200123102707.2596-1-hdanton@sina.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9509 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=609 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001240118 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9509 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=687 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001240118 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This would work but another approach would be to to allocate "usbvision" with devm_kzalloc(&dev->dev,... I believe that would postpone the free enough to solve the use after free but I hadn't tested it yet. But other drivers do that so hopefully it works. regards, dan carpenter