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mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none Received: from PU1APC01FT034.eop-APC01.prod.protection.outlook.com (10.152.252.55) by PU1APC01HT006.eop-APC01.prod.protection.outlook.com (10.152.252.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2495.25; Tue, 10 Dec 2019 13:47:28 +0000 Received: from PSXP216MB0438.KORP216.PROD.OUTLOOK.COM (10.152.252.60) by PU1APC01FT034.mail.protection.outlook.com (10.152.252.218) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2495.25 via Frontend Transport; Tue, 10 Dec 2019 13:47:28 +0000 Received: from PSXP216MB0438.KORP216.PROD.OUTLOOK.COM ([fe80::20ad:6646:5bcd:63c9]) by PSXP216MB0438.KORP216.PROD.OUTLOOK.COM ([fe80::20ad:6646:5bcd:63c9%11]) with mapi id 15.20.2516.018; Tue, 10 Dec 2019 13:47:28 +0000 From: Nicholas Johnson To: Lukas Wunner CC: Takashi Iwai , Jaroslav Kysela , Alex Deucher , Mika Westerberg , Bjorn Helgaas , "alsa-devel@alsa-project.org" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" Subject: Re: [PATCH] ALSA: hda/hdmi - Fix duplicate unref of pci_dev Thread-Topic: [PATCH] ALSA: hda/hdmi - Fix duplicate unref of pci_dev Thread-Index: AQHVr19Qzy/shWp/fkaS3esCokOlA6ezYe+A Date: Tue, 10 Dec 2019 13:47:28 +0000 Message-ID: References: <77aa6c01aefe1ebc4004e87b0bc714f2759f15c4.1575985006.git.lukas@wunner.de> In-Reply-To: <77aa6c01aefe1ebc4004e87b0bc714f2759f15c4.1575985006.git.lukas@wunner.de> Accept-Language: en-AU, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SYBPR01CA0161.ausprd01.prod.outlook.com (2603:10c6:10:d::29) To PSXP216MB0438.KORP216.PROD.OUTLOOK.COM (2603:1096:300:d::20) x-incomingtopheadermarker: OriginalChecksum:8822E6DDAEBCA3275E32C0B44E618128EA5A75984C0178C215BB876FA80DA0AD;UpperCasedChecksum:4C6AA7A74B019171A31612F64834CE4DE390DBEA3567843CB8A064DF9A3CB78A;SizeAsReceived:7875;Count:49 x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [rSOqR51/ZlJCOdU1Aomsbq7iDusPb/nJbttplY6G9V7hSOSf6rBgDiHe8esbQ6TcU+NaACFTzr0=] x-microsoft-original-message-id: <20191210134716.GB2390@nicholas-usb> x-ms-publictraffictype: Email x-incomingheadercount: 49 x-eopattributedmessage: 0 x-ms-office365-filtering-correlation-id: e55a138f-3e0c-4d62-e94d-08d77d777f1c x-ms-traffictypediagnostic: PU1APC01HT006: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: rUofl2d5uofs/ycaeu2J2Rdy3RFhQWinB+qj2a+mhM4NUuogULSOd57Rck8jrOdsLTH2WFNpkOIHrw2KELLPZkncEsMYYq8ZjTuhmeQIyX82VmwAAgyDNWr196DFzbX3Pt3dG/IZGz9AYJ7nH2xZfcBiA00BCdmf64heNkx2SQRdF2l3dgQ9CQRQhMPFCS8q x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-ID: <082416B0366C5D4983007669B103DD6C@KORP216.PROD.OUTLOOK.COM> Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: e55a138f-3e0c-4d62-e94d-08d77d777f1c X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Dec 2019 13:47:28.6634 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: PU1APC01HT006 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 10, 2019 at 02:39:50PM +0100, Lukas Wunner wrote: > Nicholas Johnson reports a null pointer deref as well as a refcount > underflow upon hot-removal of a Thunderbolt-attached AMD eGPU. > He's bisected the issue down to commit 586bc4aab878 ("ALSA: hda/hdmi - > fix vgaswitcheroo detection for AMD"). > > The commit iterates over PCI devices using pci_get_class() and > unreferences each device found, even though pci_get_class() > subsequently unreferences the device as well. Fix it. > > Fixes: 586bc4aab878 ("ALSA: hda/hdmi - fix vgaswitcheroo detection for AMD") > Link: https://lore.kernel.org/r/PSXP216MB0438BFEAA0617283A834E11580580@PSXP216MB0438.KORP216.PROD.OUTLOOK.COM/ > Reported-and-tested-by: Nicholas Johnson > Signed-off-by: Lukas Wunner > Cc: Mika Westerberg > Cc: Alexander Deucher > Cc: Bjorn Helgaas > --- > sound/pci/hda/hda_intel.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c > index 35b4526f0d28..b856b89378ac 100644 > --- a/sound/pci/hda/hda_intel.c > +++ b/sound/pci/hda/hda_intel.c > @@ -1419,7 +1419,6 @@ static bool atpx_present(void) > return true; > } > } > - pci_dev_put(pdev); > } > return false; > } > -- > 2.24.0 > Extremely fast turnaround from bisect to patch. If you want the bugzilla.kernel.org report then I can do that ASAP, but I feel that it is redundant now. Thank you for handling my bug report. Regards, Nicholas