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Thu, 1 Apr 2021 07:47:28 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 37n2arwn28-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 01 Apr 2021 07:47:28 +0000 Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 1317lQ4e016493; Thu, 1 Apr 2021 07:47:26 GMT Received: from kadam (/102.36.221.92) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 01 Apr 2021 00:47:26 -0700 Date: Thu, 1 Apr 2021 10:47:19 +0300 From: Dan Carpenter To: Yang Yingliang Cc: linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, johan@kernel.org, elder@kernel.org, gregkh@linuxfoundation.org Subject: Re: [PATCH -next v2] staging: greybus: camera: Switch to memdup_user_nul() Message-ID: <20210401074719.GP2065@kadam> References: <20210401031752.2861248-1-yangyingliang@huawei.com> <20210401074332.GO2065@kadam> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210401074332.GO2065@kadam> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-IMR: 1 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9940 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 suspectscore=0 bulkscore=0 mlxscore=0 adultscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2103310000 definitions=main-2104010053 X-Proofpoint-ORIG-GUID: hWVRwZENoBwvIUFAvOrohnWO9uz3lIkC X-Proofpoint-GUID: hWVRwZENoBwvIUFAvOrohnWO9uz3lIkC X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9940 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 impostorscore=0 phishscore=0 bulkscore=0 adultscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 suspectscore=0 spamscore=0 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2103310000 definitions=main-2104010053 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 01, 2021 at 10:43:32AM +0300, Dan Carpenter wrote: > On Thu, Apr 01, 2021 at 11:17:52AM +0800, Yang Yingliang wrote: > > Use memdup_user_nul() helper instead of open-coding to > > simplify the code. > > > > Reported-by: Hulk Robot > > Signed-off-by: Yang Yingliang > > --- > > drivers/staging/greybus/camera.c | 13 +++---------- > > 1 file changed, 3 insertions(+), 10 deletions(-) > > > > diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c > > index b570e13394ac..2ecdc1bc5092 100644 > > --- a/drivers/staging/greybus/camera.c > > +++ b/drivers/staging/greybus/camera.c > > @@ -1120,16 +1120,9 @@ static ssize_t gb_camera_debugfs_write(struct file *file, > > if (len > 1024) > > return -EINVAL; > > > > - kbuf = kmalloc(len + 1, GFP_KERNEL); > > - if (!kbuf) > > - return -ENOMEM; > > - > > - if (copy_from_user(kbuf, buf, len)) { > > - ret = -EFAULT; > > - goto done; > > - } > > - > > - kbuf[len] = '\0'; > > + kbuf = memdup_user_nul(buf, len); > > + if (IS_ERR(kbuf)) > > + return PTR_ERR(kbuf);; > ^^ > There is an extra semi-colon here. Checkpatch actually catches this > sort of typo. So when someone makes a typo like this, my response is: 1) Let's add this to checkpatch (turns out it was already done) 2) Let's grep the kernel and fix the other instances. The command would be something like: git grep ';;$' | grep '\.c:' regards, dan carpenter