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Tsirkin" , Jason Wang , Xuan Zhuo , Saeed Mahameed CC: , Dragos Tatulea , , Subject: [PATCH] vdpa/mlx5: Fix crash on shutdown for when no ndev exists Date: Wed, 26 Jul 2023 22:07:38 +0300 Message-ID: <20230726190744.14143-1-dtatulea@nvidia.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT047:EE_|MW4PR12MB6826:EE_ X-MS-Office365-Filtering-Correlation-Id: e3a8a75c-3857-44d1-730f-08db8e0ba694 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(136003)(39860400002)(396003)(376002)(346002)(451199021)(82310400008)(46966006)(36840700001)(40470700004)(26005)(1076003)(336012)(186003)(2906002)(4326008)(7636003)(356005)(36860700001)(5660300002)(47076005)(426003)(2616005)(40480700001)(316002)(83380400001)(40460700003)(41300700001)(70206006)(70586007)(36756003)(8676002)(8936002)(82740400003)(86362001)(54906003)(6636002)(110136005)(6666004)(478600001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jul 2023 19:08:09.1713 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e3a8a75c-3857-44d1-730f-08db8e0ba694 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT047.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6826 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772515266449538971 X-GMAIL-MSGID: 1772515311653570752 The ndev was accessed on shutdown without a check if it actually exists. This triggered the crash pasted below. This patch simply adds a check before using ndev. BUG: kernel NULL pointer dereference, address: 0000000000000300 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 6.5.0-rc2_for_upstream_min_debug_2023_07_17_15_05 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:mlx5v_shutdown+0xe/0x50 [mlx5_vdpa] RSP: 0018:ffff8881003bfdc0 EFLAGS: 00010286 RAX: ffff888103befba0 RBX: ffff888109d28008 RCX: 0000000000000017 RDX: 0000000000000001 RSI: 0000000000000212 RDI: ffff888109d28000 RBP: 0000000000000000 R08: 0000000d3a3a3882 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888109d28000 R13: ffff888109d28080 R14: 00000000fee1dead R15: 0000000000000000 FS: 00007f4969e0be40(0000) GS:ffff88852c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000300 CR3: 00000001051cd006 CR4: 0000000000370eb0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? __die+0x20/0x60 ? page_fault_oops+0x14c/0x3c0 ? exc_page_fault+0x75/0x140 ? asm_exc_page_fault+0x22/0x30 ? mlx5v_shutdown+0xe/0x50 [mlx5_vdpa] device_shutdown+0x13e/0x1e0 kernel_restart+0x36/0x90 __do_sys_reboot+0x141/0x210 ? vfs_writev+0xcd/0x140 ? handle_mm_fault+0x161/0x260 ? do_writev+0x6b/0x110 do_syscall_64+0x3d/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f496990fb56 RSP: 002b:00007fffc7bdde88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f496990fb56 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007fffc7bde1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fffc7bddf10 R14: 0000000000000000 R15: 00007fffc7bde2b8 CR2: 0000000000000300 ---[ end trace 0000000000000000 ]--- Fixes: bc9a2b3e686e ("vdpa/mlx5: Support interrupt bypassing") Signed-off-by: Dragos Tatulea --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index 9138ef2fb2c8..e2e7ebd71798 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -3556,7 +3556,8 @@ static void mlx5v_shutdown(struct auxiliary_device *auxdev) mgtdev = auxiliary_get_drvdata(auxdev); ndev = mgtdev->ndev; - free_irqs(ndev); + if (ndev) + free_irqs(ndev); } static const struct auxiliary_device_id mlx5v_id_table[] = {