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Petersen" , Sasha Levin Subject: [PATCH AUTOSEL for 3.18 043/102] scsi: bnx2fc: fix race condition in bnx2fc_get_host_stats() Thread-Topic: [PATCH AUTOSEL for 3.18 043/102] scsi: bnx2fc: fix race condition in bnx2fc_get_host_stats() Thread-Index: AQHTv50S8RSqwIZeJEGGDDQcF5enUA== Date: Mon, 19 Mar 2018 16:12:25 +0000 Message-ID: <20180319161117.17833-43-alexander.levin@microsoft.com> References: <20180319161117.17833-1-alexander.levin@microsoft.com> In-Reply-To: <20180319161117.17833-1-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;DM5PR2101MB1048;7:xraMRBMd/IZwNNMyUC7aA/N32KU40P732LCrDr0VkIZFUis7jEDgu0GI5qTX+v+pQ1iTErchg1G2j3cIo66mPPzjQwvSd4YZTkItIEtHskX/l6n9UUwupKWiE2m86NHNO2Qvlk6QVuwLnpEZCNX0CDEVuR/bHX2FdzP7boq+mnkGVyrFvTYc1qK/k/1syK/ndGlnvMNJ7sUtnxkyCmPlJ0CKK2eUtKTjvXIg7glfngPOGaHqFkiqQ0PgOEzZSj6T;20:urUrXe2Hjbq3Smtox0P+Kf2g9b7jNmIcNVjGeDA07ltS0xOCTs/O2/P3x99GZuVA+QVU6JI/nIsD5EsHmTmSRYGWrKLGxU4yJPGajL6KFObXnqSz02TYaJtIwkU2/WzHZeroPz5Ko9iOD4I8whvcPYWy8B+6rxb+qUg4L04zioI= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 561113af-0420-4464-ecbc-08d58db44489 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1048; x-ms-traffictypediagnostic: DM5PR2101MB1048: 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)(6040522)(2401047)(5005006)(8121501046)(3231221)(944501300)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(20161123562045)(20161123564045)(20161123558120)(6072148)(201708071742011);SRVR:DM5PR2101MB1048;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1048; x-forefront-prvs: 06167FAD59 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(366004)(376002)(346002)(396003)(39860400002)(39380400002)(199004)(189003)(3846002)(6116002)(59450400001)(305945005)(6436002)(36756003)(54906003)(110136005)(53936002)(15760500003)(14454004)(97736004)(3660700001)(99286004)(76176011)(22452003)(7736002)(6512007)(316002)(6486002)(186003)(86362001)(2950100002)(6666003)(5250100002)(66066001)(3280700002)(102836004)(107886003)(10090500001)(106356001)(25786009)(6506007)(26005)(8936002)(2906002)(81156014)(81166006)(2900100001)(8676002)(86612001)(2501003)(478600001)(105586002)(1076002)(68736007)(4326008)(72206003)(5660300001)(10290500003)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1048;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-microsoft-antispam-message-info: X3l4ItccP6BcYR8LRtpgeQK0Zxkn9pmKLGSF1As9E+HyUb4sQgC7BuHhTqxhk4cTg5JdCcPjnnylom6Tl09dWmCs2zvVw3aqpgNif+ydT4VbBkdi6hGB1Eh/yYGAUzFHVzh5g9EheaC4GjMmoDRvA8aVq627dREgOs+U/xI9AUYMZOTFZFsUYN2jbr4yiL19D0iegfAyfg9tiw0s/8zQpzDTL1+MN0lQ0un563HL0BAwGsVaPAFAJGXLxbMTjl9OR+Qep4pLnE8dmcuIwa2UHU9kbAmI8eTYblEuCCq5S4Y7rfpL+FMs1K7JSTTS4yFD2ihSfHwJwjW7EPg+TB+k+g== 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: 561113af-0420-4464-ecbc-08d58db44489 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:12:25.8293 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1048 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: Maurizio Lombardi [ Upstream commit c2dd893a3b0772d1c680e109b9d5715d7f73022b ] If multiple tasks attempt to read the stats, it may happen that the start_req_done completion is re-initialized while still being used by another task, causing a list corruption. This patch fixes the bug by adding a mutex to serialize the calls to bnx2fc_get_host_stats(). WARNING: at lib/list_debug.c:48 list_del+0x6e/0xa0() (Not tainted) Hardware name: PowerEdge R820 list_del corruption. prev->next should be ffff882035627d90, but was ffff884= 069541588 Pid: 40267, comm: perl Not tainted 2.6.32-642.3.1.el6.x86_64 #1 Call Trace: [] ? warn_slowpath_common+0x91/0xe0 [] ? warn_slowpath_fmt+0x46/0x60 [] ? list_del+0x6e/0xa0 [] ? wait_for_common+0x14d/0x180 [] ? default_wake_function+0x0/0x20 [] ? wait_for_completion_timeout+0x13/0x20 [] ? bnx2fc_get_host_stats+0xa1/0x280 [bnx2fc] [] ? fc_stat_show+0x90/0xc0 [scsi_transport_fc] [] ? show_fcstat_tx_frames+0x16/0x20 [scsi_transport_fc] [] ? dev_attr_show+0x27/0x50 [] ? __get_free_pages+0xe/0x50 [] ? sysfs_read_file+0x111/0x200 [] ? vfs_read+0xb5/0x1a0 [] ? fget_light_pos+0x16/0x50 [] ? sys_read+0x51/0xb0 [] ? __audit_syscall_exit+0x25e/0x290 [] ? system_call_fastpath+0x16/0x1b Signed-off-by: Maurizio Lombardi Acked-by: Chad Dupuis Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/bnx2fc/bnx2fc.h | 1 + drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/bnx2fc/bnx2fc.h b/drivers/scsi/bnx2fc/bnx2fc.h index 1346e052e03c..8009158a6639 100644 --- a/drivers/scsi/bnx2fc/bnx2fc.h +++ b/drivers/scsi/bnx2fc/bnx2fc.h @@ -191,6 +191,7 @@ struct bnx2fc_hba { struct bnx2fc_cmd_mgr *cmd_mgr; spinlock_t hba_lock; struct mutex hba_mutex; + struct mutex hba_stats_mutex; unsigned long adapter_state; #define ADAPTER_STATE_UP 0 #define ADAPTER_STATE_GOING_DOWN 1 diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc= _fcoe.c index 72533c58c1f3..2577f8e86be3 100644 --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c @@ -641,15 +641,17 @@ static struct fc_host_statistics *bnx2fc_get_host_sta= ts(struct Scsi_Host *shost) if (!fw_stats) return NULL; =20 + mutex_lock(&hba->hba_stats_mutex); + bnx2fc_stats =3D fc_get_host_stats(shost); =20 init_completion(&hba->stat_req_done); if (bnx2fc_send_stat_req(hba)) - return bnx2fc_stats; + goto unlock_stats_mutex; rc =3D wait_for_completion_timeout(&hba->stat_req_done, (2 * HZ)); if (!rc) { BNX2FC_HBA_DBG(lport, "FW stat req timed out\n"); - return bnx2fc_stats; + goto unlock_stats_mutex; } BNX2FC_STATS(hba, rx_stat2, fc_crc_cnt); bnx2fc_stats->invalid_crc_count +=3D hba->bfw_stats.fc_crc_cnt; @@ -671,6 +673,9 @@ static struct fc_host_statistics *bnx2fc_get_host_stats= (struct Scsi_Host *shost) =20 memcpy(&hba->prev_stats, hba->stats_buffer, sizeof(struct fcoe_statistics_params)); + +unlock_stats_mutex: + mutex_unlock(&hba->hba_stats_mutex); return bnx2fc_stats; } =20 @@ -1303,6 +1308,7 @@ static struct bnx2fc_hba *bnx2fc_hba_create(struct cn= ic_dev *cnic) } spin_lock_init(&hba->hba_lock); mutex_init(&hba->hba_mutex); + mutex_init(&hba->hba_stats_mutex); =20 hba->cnic =3D cnic; =20 --=20 2.14.1