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Mon, 26 Nov 2018 20:31:51 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id wAQKVnLB019262 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 26 Nov 2018 20:31:50 GMT 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 wAQKVmo1007485; Mon, 26 Nov 2018 20:31:49 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 26 Nov 2018 12:31:48 -0800 Subject: Re: [Xen-devel] [PATCH] pvcalls-front: fixes incorrect error handling To: Pan Bian , Juergen Gross , Stefano Stabellini , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org References: <1542852432-30019-1-git-send-email-bianpan2016@163.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; prefer-encrypt=mutual; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: <1542852432-30019-1-git-send-email-bianpan2016@163.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9089 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=29 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811260174 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/21/18 9:07 PM, Pan Bian wrote: > kfree() is incorrectly used to release the pages allocated by > __get_free_page() and __get_free_pages(). Use the matching deallocators > i.e., free_page() and free_pages(), respectively. > > Signed-off-by: Pan Bian > --- > drivers/xen/pvcalls-front.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c > index 2f11ca7..77224d8 100644 > --- a/drivers/xen/pvcalls-front.c > +++ b/drivers/xen/pvcalls-front.c > @@ -385,8 +385,8 @@ static int create_active(struct sock_mapping *map, int *evtchn) > out_error: > if (*evtchn >= 0) > xenbus_free_evtchn(pvcalls_front_dev, *evtchn); > - kfree(map->active.data.in); > - kfree(map->active.ring); > + free_pages((unsigned long)map->active.data.in, PVCALLS_RING_ORDER); Is map->active.data.in guaranteed to be NULL when entering this routine? -boris > + free_page((unsigned long)map->active.ring); > return ret; > } >