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Petersen" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 006/101] scsi: sg: close race condition in sg_remove_sfp_usercontext() Thread-Topic: [PATCH AUTOSEL for 4.4 006/101] scsi: sg: close race condition in sg_remove_sfp_usercontext() Thread-Index: AQHTtpp5CD1X+yyc5kqfocCer0sB5Q== Date: Thu, 8 Mar 2018 05:01:10 +0000 Message-ID: <20180308050023.8548-6-alexander.levin@microsoft.com> References: <20180308050023.8548-1-alexander.levin@microsoft.com> In-Reply-To: <20180308050023.8548-1-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;DM5PR2101MB0981;7:CvnaN2PK3ahJgpDWqj/oTB811JS9mF95HZQV3vHF03NMesOOL9w/nAhNcE+h9VPUkvyHzTU6Err/bcG0Dset3RuipHACY1FlVR6RzpUivmwoGHY0rL1UhRaC3F/VJ/i63Vp5wBGWKD4Z3OKgfWrnEM2Yq21xhgK3xVVkD/P2aU842eWn50cHQCJ9KEJYe0DA6vRCnJiHWweOsSO4gKvf3iMIxQ38Nt97PkgtwalZ3XoKD8W3IfDaPs1MaQUIGQ8w;20:gJ91oBfRKv6NnfZ6n+LpK0CXchAs3c+ecgG2KfR8oK9GBPNsuzyOp5+710mJJ3rIU000cLrXGnCqcPGIxV0ZGpybT2kxBpZVUt47UtA5HCRp0jMGrfHH6NPl4qNLt7kiGAek806bfKUFwY+JE9eQZDUjtJsKiACFv8C7Q9wSsxg= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 251f5453-dc24-42b4-c353-08d584b22818 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0981; x-ms-traffictypediagnostic: DM5PR2101MB0981: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(146099531331640); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040501)(2401047)(8121501046)(5005006)(93006095)(93001095)(3231220)(944501244)(52105095)(10201501046)(3002001)(6055026)(61426038)(61427038)(6041288)(20161123562045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123560045)(6072148)(201708071742011);SRVR:DM5PR2101MB0981;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0981; x-forefront-prvs: 060503E79B x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(39860400002)(39380400002)(396003)(366004)(346002)(376002)(199004)(189003)(305945005)(86612001)(2906002)(7736002)(6486002)(36756003)(54906003)(110136005)(6436002)(6666003)(2950100002)(10290500003)(316002)(186003)(22452003)(10090500001)(478600001)(105586002)(6512007)(53936002)(66066001)(68736007)(76176011)(102836004)(3280700002)(107886003)(25786009)(8936002)(59450400001)(106356001)(6506007)(5660300001)(3846002)(97736004)(14454004)(2501003)(26005)(5250100002)(4326008)(3660700001)(86362001)(575784001)(6116002)(81166006)(99286004)(72206003)(2900100001)(1076002)(8676002)(81156014)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0981;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; x-microsoft-antispam-message-info: KUNY37QORVFYWIyaiFAUqwfy7+mMIdE0YJlfQKLP38S26hUxLgYfMYoRee61KbQkOtZrpaUUh3qXcM6shhgargFr49SjIw9xKflrsDAAn7tYo4LzNEpCcxPSJfovxHTfBPtNH8A68EKBb8SBzfvANWhZHcrKnPyXryK5Miyz33oKxovAXUGcg920A/oh6AQfr1DkvsxyCNaKnlG9CsrpCO66OY8iJG4J8QTiY87gTJ5Aoy/uYEg7PgIfwFK1/Wfp1PRES9u02pii003+UG3u5YR8D32r1RDNBQYY/Z5ukOpAQs3Sw8Eia1M4wLyukzFyJ0iWM3YgPcB9r/8qLTirdw== 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: 251f5453-dc24-42b4-c353-08d584b22818 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 05:01:10.3321 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0981 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: Hannes Reinecke [ Upstream commit 97d27b0dd015e980ade63fda111fd1353276e28b ] sg_remove_sfp_usercontext() is clearing any sg requests, but needs to take 'rq_list_lock' when modifying the list. Reported-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn Tested-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/sg.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 27f92f4ea6bc..dedaf3e89bb5 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -535,6 +535,7 @@ sg_read(struct file *filp, char __user *buf, size_t cou= nt, loff_t * ppos) } else count =3D (old_hdr->result =3D=3D 0) ? 0 : -EIO; sg_finish_rem_req(srp); + sg_remove_request(sfp, srp); retval =3D count; free_old_hdr: kfree(old_hdr); @@ -575,6 +576,7 @@ sg_new_read(Sg_fd * sfp, char __user *buf, size_t count= , Sg_request * srp) } err_out: err2 =3D sg_finish_rem_req(srp); + sg_remove_request(sfp, srp); return err ? : err2 ? : count; } =20 @@ -811,6 +813,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp, SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, "sg_common_write: start_req err=3D%d\n", k)); sg_finish_rem_req(srp); + sg_remove_request(sfp, srp); return k; /* probably out of space --> ENOMEM */ } if (atomic_read(&sdp->detaching)) { @@ -823,6 +826,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp, } =20 sg_finish_rem_req(srp); + sg_remove_request(sfp, srp); return -ENODEV; } =20 @@ -1312,6 +1316,7 @@ sg_rq_end_io_usercontext(struct work_struct *work) struct sg_fd *sfp =3D srp->parentfp; =20 sg_finish_rem_req(srp); + sg_remove_request(sfp, srp); kref_put(&sfp->f_ref, sg_remove_sfp); } =20 @@ -1856,8 +1861,6 @@ sg_finish_rem_req(Sg_request *srp) else sg_remove_scat(sfp, req_schp); =20 - sg_remove_request(sfp, srp); - return ret; } =20 @@ -2204,12 +2207,17 @@ sg_remove_sfp_usercontext(struct work_struct *work) struct sg_fd *sfp =3D container_of(work, struct sg_fd, ew.work); struct sg_device *sdp =3D sfp->parentdp; Sg_request *srp; + unsigned long iflags; =20 /* Cleanup any responses which were never read(). */ + write_lock_irqsave(&sfp->rq_list_lock, iflags); while (!list_empty(&sfp->rq_list)) { srp =3D list_first_entry(&sfp->rq_list, Sg_request, entry); sg_finish_rem_req(srp); + list_del(&srp->entry); + srp->parentfp =3D NULL; } + write_unlock_irqrestore(&sfp->rq_list_lock, iflags); =20 if (sfp->reserve.bufflen > 0) { SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, --=20 2.14.1