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Wed, 17 Sep 2025 14:55:55 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 88E2F5803F; Wed, 17 Sep 2025 14:55:55 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 52B5B58054; Wed, 17 Sep 2025 14:55:50 +0000 (GMT) Received: from [9.109.215.183] (unknown [9.109.215.183]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Wed, 17 Sep 2025 14:55:49 +0000 (GMT) Message-ID: <676712d1-7b4f-4614-bd82-5b0c43881865@linux.ibm.com> Date: Wed, 17 Sep 2025 20:25:48 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] drivers/base/node: Handle error properly in register_one_node() To: Chris Mason Cc: David Hildenbrand , Andrew Morton , Oscar Salvador , Zi Yan , Greg Kroah-Hartman , Ritesh Harjani , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Rafael J . Wysocki" , Danilo Krummrich , Jonathan Cameron , Alison Schofield , Yury Norov , Dave Jiang , KAMEZAWA Hiroyuki References: <20250917134604.2149316-1-clm@meta.com> Content-Language: en-US From: Donet Tom In-Reply-To: <20250917134604.2149316-1-clm@meta.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: wA33Ic2Fwwy0CtaNYj3S3UXMkwZMpURl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTE2MDIwNCBTYWx0ZWRfX8X65/ufRsGVo bDCC1dccNXM0EWET9nYDeBvXFOX+osCHHAFBagTCHm/nXv88A/WHoQGYfDDSJPHh6iUGiqByniK +Ps8jp+GPtn3Xlu318ZUmH9rZiXD6BRqERZDWz/JLpdHd4oxCxqN6zGWmPxnlWYEbbq03gw6lTS +FDJXupWDT/2BakFtzHXEVPFMuqWOTiXsaLJ6o5Ai2iZpP8aHeSnktedd2SEN2rqVw7q1Su/dup wn7Y0HRnt0UD9vX8e7XWpmFQ407ic2GoO0Clnmjh1KK9aG3/kNQAr1J99sh5R2qTiVbMM57JiGx fE9xNOS5gUBJfpnUNGkBw1+NN8uOO+GnKiFitv97Z4pDWeX92o9YnbAHCPAYf0O2njuJC1FKeX4 1sBNEDUh X-Authority-Analysis: v=2.4 cv=R8oDGcRX c=1 sm=1 tr=0 ts=68cacbfd cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=rKeXGq08CVa402lCTmoA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: EX0LyWaAr9H_o1C6qQrgirVdE316IUWH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-17_01,2025-09-17_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 suspectscore=0 malwarescore=0 bulkscore=0 spamscore=0 adultscore=0 impostorscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509160204 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DDA53100011 X-Stat-Signature: pbj1fyi98jjj8i1jpgo8oc4gbokdfmre X-Rspam-User: X-HE-Tag: 1758120973-342078 X-HE-Meta: U2FsdGVkX1+JCinMjYjcOxV9TtcKWE11X+rCQc+AJDa6D/+Xu4GLE3MvZtO2jN2XzGmFIqAuwcOCiNO1C61QBKJQodW3V2Z7e1EEMEKJyVHsdJvOMwBBnODML0LxsddFJ5JVo0Bhinz+mfq3ttnjSCG7lVXIARB+Quw9AHBGi+5NFZGLBrZMth16gJmDRZUkwYxFGZgXHcOEq7olKSlC3sOXEZae3JWkLAOGUkLAQNUQ7l+gPd1bYOdhiUKFNT5bdzJdeZG9hk3jLFZcfQWPAfoNWGMhkueN0UTwezQeebQ79JApsweyS3QaZMo1FlMKdC9cer3wSfWDMIHTpeLXs54OClJjw6dFHgytSW8T/a4o3KlThe6c+jFes00mXnoHanX3rXg5tZCw4iUoP7d6DLaUs22FjWYoc3qDv+nE8jKjVoYa58q3UUmXP0Tzb81gwbCDeEpuHfTUcsdoTJ+qDDQ24fnXce9T+vZHAnqNtD1sbC0V9e5ZNPDS2nZSO8R0q2YdPy3EqvgeskQpxcuSkGxifQCz4Bz2SOPuioVzf4Oxg8imeEd4fv6eQVhZu+1PmpBCYfB36PnSpuIoU+Zw3snSXU6Jj3Eq0ml+oebTVPkzbtiWEvCDFqVnpcxUUy4Eb2EVbXnkFuO/xO6HuegswJdfpUQRRTklqCrsAyT5QKsWLlCrrQpwRWG4qYkW2JYm/1sqo1PoWmzeTrVQFT39SGF5uRp8QJLyiFFnsZ8OKiDnk/C3BC4shMEKxrlUIDG8oB5g51NYV+en/B9p1IT+fsghojmEpbH2MUsDCdec8KKiwc7qYMf79wyu0rwuX0ueVo/DKLlpVT5WgLlsVc1/OCkaCnzVVAQeG3Eza4TR0IC6r/559iuWQee6Ux5LDnU7fgq7NxXB2J294RePtf+zfAnHFos7zkhLX7+kEOnAWeSY/2fVvHWtzyomn1Y4khz47acFqM3XGEM3/KCKvzn SQbS8HBt Qa4VFQsAgVAYbrPCgBjwB6kPLE6lAmHoYqVqwDBApkOSWGotjf5maK0iLJrJuMZpQDmmpM+tqSOfa0iY9z7lTDh+ybgm/U4Y9ZYyuDay64G9RqPjfkqRBU2xlsqxi48/fhbfGMhtcBRTyEeqVO+jKMHWHVOfFYUpi++n5k65D88WqawrrbR2dAfddHTdNGYnk54yePEujNni9T8nHb8Exe7MuAVp/5MU10rvVFtiEqcg1E6hRPKoZbLonkVNFcR/spSnaaHplXaa8t6bo+R4u2iJqpFJmLtqHj2IznDKspClwkTmujYRd6mmKZ/zTz0pb86ZwKXD8d/PXRYlqmrHih+xBoXLJMQaa3jxNCF+Flv1tVs/lpLiXr9jFmI+bLyeBXnxlHNtGRO00KB/IJEFn+wvcKEYeGBzfdQ6N X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/17/25 7:15 PM, Chris Mason wrote: > On Fri, 22 Aug 2025 14:18:45 +0530 Donet Tom wrote: > >> If register_node() returns an error, it is not handled correctly. >> The function will proceed further and try to register CPUs under the >> node, which is not correct. >> >> So, in this patch, if register_node() returns an error, we return >> immediately from the function. >> >> Fixes: 76b67ed9dce6 ("[PATCH] node hotplug: register cpu: remove node struct") >> Signed-off-by: Donet Tom >> --- >> v1 -> v2 >> Made the changes based on Oscar’s review comments. >> >> v1 - https://lore.kernel.org/all/20250702112856.295176-1-donettom@linux.ibm.com/ >> --- >> drivers/base/node.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/base/node.c b/drivers/base/node.c >> index c65b4917794e..1608816de67f 100644 >> --- a/drivers/base/node.c >> +++ b/drivers/base/node.c >> @@ -883,6 +883,11 @@ int register_one_node(int nid) >> node_devices[nid] = node; >> >> error = register_node(node_devices[nid], nid); >> + if (error) { >> + node_devices[nid] = NULL; >> + kfree(node); >> + return error; >> + } > Can this cause a double-free? Looking at register_node(), when > device_register() fails, it calls put_device(&node->dev). The put_device() > call triggers node_device_release() which does kfree(to_node(dev)), freeing > the entire node structure. So when register_node() returns an error, the > node memory is already freed, but this code calls kfree(node) again on the > same memory. > > The call chain is: register_node()->device_register() fails-> > put_device()->node_device_release()->kfree(to_node(dev)). Thank you for pointing this out. I will address it and send a v3. > > [ This came from automated patch review, but it looks real to me ] > > -chris >