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Mon, 16 Feb 2026 16:26:52 +0000 Received: from CPUPR80MB8171.lamprd80.prod.outlook.com ([fe80::18b5:f8c:1f:ef82]) by CPUPR80MB8171.lamprd80.prod.outlook.com ([fe80::18b5:f8c:1f:ef82%6]) with mapi id 15.20.9611.013; Mon, 16 Feb 2026 16:26:52 +0000 From: Raul Pazemecxas De Andrade To: Greg KH CC: "sj@kernel.org" , "security@kernel.org" , "damon@lists.linux.dev" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: RE: [BUG] mm/damon/core: dangling walk_control pointer in damos_walk() on inactive context Thread-Topic: [BUG] mm/damon/core: dangling walk_control pointer in damos_walk() on inactive context Thread-Index: AQHcn1mbZ6+3hbtq+UqnnhH5daxyMrWFedkAgAAJcrY= Date: Mon, 16 Feb 2026 16:26:52 +0000 Message-ID: References: <2026021646-sandbox-duchess-5b7b@gregkh> In-Reply-To: <2026021646-sandbox-duchess-5b7b@gregkh> Accept-Language: pt-BR, en-US Content-Language: pt-BR X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: CPUPR80MB8171:EE_|RO2PR80MB6326:EE_ x-ms-office365-filtering-correlation-id: cf25873f-78c0-416c-804d-08de6d783130 x-microsoft-antispam: BCL:0;ARA:14566002|19110799012|8062599012|8060799015|15030799006|15080799012|12121999013|31061999003|51005399006|461199028|40105399003|440099028|3412199025|102099032|26104999006; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-9412-4-msonline-outlook-8eed7.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CPUPR80MB8171.lamprd80.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: cf25873f-78c0-416c-804d-08de6d783130 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Feb 2026 16:26:52.0840 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: RO2PR80MB6326 X-Stat-Signature: uskub5uuzmj1ifosa7f9sie5hp4r9inr X-Rspamd-Queue-Id: 98921140004 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1771259215-577956 X-HE-Meta: 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 bHYkq1rz 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.007401, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Thanks for your attention Greg and congratulations on your work on our Kern= el=0A= ________________________________________=0A= De:=A0Greg KH =0A= Enviadas:=A0Segunda-feira, 16 de Fevereiro de 2026 12:52=0A= Para:=A0Raul Pazemecxas De Andrade =0A= Cc:=A0sj@kernel.org ; security@kernel.org ; damon@lists.linux.dev ; linux-mm@kvack.org ; linux-kernel@vger.kernel.org =0A= Assunto:=A0Re: [BUG] mm/damon/core: dangling walk_control pointer in damos_= walk() on inactive context=0A= =0A= =0A= On Mon, Feb 16, 2026 at 03:34:44PM +0000, Raul Pazemecxas De Andrade wrote:= =0A= =0A= > Root cause=0A= =0A= > ----------=0A= =0A= >=0A= =0A= > Commit bf0eaba0ff9c ("mm/damon/core: implement damos_walk()")=0A= =0A= > introduced this function without cleanup on the -EINVAL error path.=0A= =0A= >=0A= =0A= > The sibling function damon_call() had the exact same bug and was=0A= =0A= > fixed in f9132fbc2e83 by adding damon_call_handle_inactive_ctx()=0A= =0A= > which removes the control object when the context is inactive.=0A= =0A= > damos_walk() has no equivalent cleanup.=0A= =0A= =0A= =0A= Can you submit a patch to resolve this to get credit for fixing the bug?=0A= =0A= =0A= =0A= thanks,=0A= =0A= =0A= =0A= greg k-h=0A= =0A=