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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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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=