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15.21.0181.012; Tue, 7 Jul 2026 06:55:09 +0000 Message-ID: <66efd2f3-b6c3-4e6d-b1b9-5640db61ebd9@windriver.com> Date: Tue, 7 Jul 2026 14:55:02 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] media: dvb-core: fix use-after-free in dvb_frontend_open() To: mchehab@kernel.org, kees@kernel.org, linma@zju.edu.cn Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, yun.zhou@windriver.com References: <20260610083055.3976083-1-yun.zhou@windriver.com> Content-Language: en-US From: "Zhou, Yun" In-Reply-To: <20260610083055.3976083-1-yun.zhou@windriver.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SI2PR02CA0011.apcprd02.prod.outlook.com (2603:1096:4:194::20) To CH0PR11MB5332.namprd11.prod.outlook.com (2603:10b6:610:bf::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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definitions=2026-07-07_01,2026-07-06_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 phishscore=0 suspectscore=0 impostorscore=0 malwarescore=0 spamscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607070065 Friendly ping On 6/10/26 16:30, Yun Zhou wrote: > dvb_frontend_open() calls dvb_generic_release() in its error path after > dvb_generic_open() succeeds. dvb_generic_release() drops the device > reference via dvb_device_put(), and then dvb_device_open() drops it again > in its error handling, causing a use-after-free and refcount underflow. > > Fix this by incrementing the refcount before dvb_generic_release() in the > error path, so that the put inside dvb_generic_release() is balanced and > dvb_device_open() remains the sole effective put on open failure. > > Reported-by: syzbot+40339ea82afa8184ad5d@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=40339ea82afa8184ad5d > Cc: stable@vger.kernel.org > Fixes: 0fc044b2b5e2 ("media: dvbdev: adopts refcnt to avoid UAF") > Signed-off-by: Yun Zhou > --- > v3: > - Simplify fix: increment refcount before dvb_generic_release() instead > of introducing __dvb_generic_release() > > v2: > - Fix Fixes tag commit title > - Add Closes: link after Reported-by > - Cc stable@vger.kernel.org > > drivers/media/dvb-core/dvb_frontend.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c > index d082b6c57c76..608525d08277 100644 > --- a/drivers/media/dvb-core/dvb_frontend.c > +++ b/drivers/media/dvb-core/dvb_frontend.c > @@ -2887,6 +2887,7 @@ static int dvb_frontend_open(struct inode *inode, struct file *file) > mutex_unlock(&fe->dvb->mdev_lock); > err2: > #endif > + dvb_device_get(dvbdev); > dvb_generic_release(inode, file); > err1: > if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)