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Petersen" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 31/35] scsi: aacraid: Prevent crash in case of free interrupt during scsi EH path Thread-Topic: [PATCH AUTOSEL for 4.4 31/35] scsi: aacraid: Prevent crash in case of free interrupt during scsi EH path Thread-Index: AQHTlMozXTY5Dkpr0UiD39IOQ3gczw== Date: Wed, 24 Jan 2018 04:17:08 +0000 Message-ID: <20180124041645.32420-31-alexander.levin@microsoft.com> References: <20180124041645.32420-1-alexander.levin@microsoft.com> In-Reply-To: <20180124041645.32420-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0998;6:uLvE1o0CHhRFWmjCCPSLoL8zpytZS+0kZgVxPT4FJ5nLLbcjJRxbZN2p/tCuF4KhA3OYFjc10tisBTLBPI/w7x80MVOfEGQGG1w75RJmCxoQV8TXb+uln2O9+6Ehldnbg6er1RdnhKsn+Zez4EF3hcQR8SZN4sJE0OiwV8pUVOEEzvjM7Yh51BJ4Q9lG8kGlf0fpdHgjyW5Tu4g4dsH+a0eP04SjEXcRjVh9IOJcejIWBhO/XYB7R3pYjSavsmg/Um+fBggv6aXrswB0/lWfkzb6XXD9OJUKyuXoJnFcD4wOcXIFID0P+bq30kof+mY4foisZMA8szr7giLQVx8fo6eybZmfeIaV0V9hc8RtEBCBlWJhcEM3hT/77lQYkfy8;5:52+Vm5B2Al/HHODS0tyWFsPE2v08iQDdPDR++YwM/ZYS3wxm17ZxFIypRR+nOY9Vd3M8mDBK0+AVJYJb+URczarcvM0eHMCSaMOnuZYu9NSiSrxCzJrXeHWS/7CBVO4sOCFR8tFpho7H6YEM2HyP/w8uP2/Brk3bPLVX346T/7Y=;24:MVBdCMPpbrYt25qIjblj/iIh0fXD1o6zlVsA/q8c4Kxetb/rv8My4c7w5l2iEwnvGEXhjii6msIZ4MHVCxO2mTdA01NMmBWliW3yYmm2inA=;7:CyBgWmKWGWB6mocbRDHEAMlKwncjUk85EFAkMcvZyqCbjigHHFujqNLzIzmeQGLqVfCvLoUBrxILiP0FVkS0AQ3XbdBeDNr1qqb26qbCeP2H7sDT0tWcohhBbir37I6jvvAb++C9hY0T9gZ4tcjEam0fOfwN/OA4bRjtlzlECuG2LKEnuXXB/+uMOEzBZBvi1a8NURnmeUpTUMzwdPScCNuB9dKSxKhs2ZRf35sKNG1PGQrH/6PWrjpNTVEtLMu1 x-ms-office365-filtering-correlation-id: 897bdb18-d6f5-4efb-494e-08d562e1bb00 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(2017052603307)(7193020);SRVR:DM5PR2101MB0998; x-ms-traffictypediagnostic: DM5PR2101MB0998: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(72170198267865)(104084551191319)(146099531331640); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(61425038)(6040501)(2401047)(5005006)(8121501046)(3002001)(10201501046)(3231046)(2400081)(944501161)(93006095)(93001095)(6055026)(61426038)(61427038)(6041288)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123560045)(20161123558120)(20161123562045)(6072148)(201708071742011);SRVR:DM5PR2101MB0998;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0998; x-forefront-prvs: 056297E276 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(366004)(39380400002)(346002)(39860400002)(396003)(376002)(199004)(189003)(14454004)(3660700001)(6346003)(10290500003)(105586002)(66066001)(6506007)(8676002)(22452003)(86612001)(54906003)(10090500001)(81166006)(81156014)(76176011)(110136005)(86362001)(68736007)(106356001)(59450400001)(8936002)(3280700002)(36756003)(25786009)(107886003)(2501003)(6666003)(99286004)(2906002)(26005)(2950100002)(72206003)(102836004)(305945005)(6116002)(3846002)(5660300001)(4326008)(478600001)(316002)(53936002)(97736004)(2900100001)(5250100002)(6512007)(6436002)(6486002)(1076002)(7736002)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0998;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: dyT44ECfgZ2TkRqXrOqeHvCnkck9rjLFLLpzWKwtf6CcZ6F57RjLvW26JkCfSOxvT+qTD9J0zVvOi34lWoTCVg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 897bdb18-d6f5-4efb-494e-08d562e1bb00 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2018 04:17:08.7857 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0998 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: "Guilherme G. Piccoli" [ Upstream commit e4717292ddebcfe231651b5aff9fa19ca158d178 ] As part of the scsi EH path, aacraid performs a reinitialization of the adapter, which encompass freeing resources and IRQs, NULLifying lots of pointers, and then initialize it all over again. We've identified a problem during the free IRQ portion of this path if CONFIG_DEBUG_SHIRQ is enabled on kernel config file. Happens that, in case this flag was set, right after free_irq() effectively clears the interrupt, it checks if it was requested as IRQF_SHARED. In positive case, it performs another call to the IRQ handler on driver. Problem is: since aacraid currently free some resources *before* freeing the IRQ, once free_irq() path calls the handler again (due to CONFIG_DEBUG_SHIRQ), aacraid crashes due to NULL pointer dereference with the following trace: aac_src_intr_message+0xf8/0x740 [aacraid] __free_irq+0x33c/0x4a0 free_irq+0x78/0xb0 aac_free_irq+0x13c/0x150 [aacraid] aac_reset_adapter+0x2e8/0x970 [aacraid] aac_eh_reset+0x3a8/0x5d0 [aacraid] scsi_try_host_reset+0x74/0x180 scsi_eh_ready_devs+0xc70/0x1510 scsi_error_handler+0x624/0xa20 This patch prevents the crash by changing the order of the deinitialization in this path of aacraid: first we clear the IRQ, then we free other resources. No functional change intended. Signed-off-by: Guilherme G. Piccoli Reviewed-by: Raghava Aditya Renukunta Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/aacraid/commsup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.= c index 8c758c36fc70..766a9176b4ad 100644 --- a/drivers/scsi/aacraid/commsup.c +++ b/drivers/scsi/aacraid/commsup.c @@ -1363,13 +1363,13 @@ static int _aac_reset_adapter(struct aac_dev *aac, = int forced) * will ensure that i/o is queisced and the card is flushed in that * case. */ + aac_free_irq(aac); aac_fib_map_free(aac); pci_free_consistent(aac->pdev, aac->comm_size, aac->comm_addr, aac->comm_= phys); aac->comm_addr =3D NULL; aac->comm_phys =3D 0; kfree(aac->queues); aac->queues =3D NULL; - aac_free_irq(aac); kfree(aac->fsa_dev); aac->fsa_dev =3D NULL; quirks =3D aac_get_driver_ident(index)->quirks; --=20 2.11.0