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Thu, 29 Dec 2022 03:04:17 -0800 From: Avihai Horon To: CC: Alex Williamson , Halil Pasic , Christian Borntraeger , Eric Farman , Richard Henderson , David Hildenbrand , "Ilya Leoshkevich" , Thomas Huth , "Juan Quintela" , "Dr. David Alan Gilbert" , "Michael S. Tsirkin" , Cornelia Huck , Paolo Bonzini , Stefan Hajnoczi , Fam Zheng , Eric Blake , Vladimir Sementsov-Ogievskiy , John Snow , , , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Avihai Horon , Kirti Wankhede , Tarun Gupta , Joao Martins Subject: [PATCH v5 04/14] vfio/migration: Fix NULL pointer dereference bug Date: Thu, 29 Dec 2022 13:03:35 +0200 Message-ID: <20221229110345.12480-5-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20221229110345.12480-1-avihaih@nvidia.com> References: <20221229110345.12480-1-avihaih@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF0000E63E:EE_|SJ0PR12MB6759:EE_ X-MS-Office365-Filtering-Correlation-Id: fb1f3fa8-fb9a-4b58-e706-08dae98c775b 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:(13230022)(4636009)(136003)(376002)(396003)(346002)(39860400002)(451199015)(36840700001)(40470700004)(46966006)(70586007)(5660300002)(70206006)(4326008)(8676002)(41300700001)(8936002)(26005)(7416002)(426003)(186003)(2616005)(36756003)(6916009)(2906002)(54906003)(356005)(40460700003)(478600001)(316002)(86362001)(6666004)(40480700001)(336012)(7696005)(1076003)(47076005)(82740400003)(7636003)(82310400005)(36860700001)(83380400001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Dec 2022 11:04:33.1832 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fb1f3fa8-fb9a-4b58-e706-08dae98c775b 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: DS1PEPF0000E63E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6759 Received-SPF: permerror client-ip=40.107.236.40; envelope-from=avihaih@nvidia.com; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org As part of its error flow, vfio_vmstate_change() accesses MigrationState->to_dst_file without any checks. This can cause a NULL pointer dereference if the error flow is taken and MigrationState->to_dst_file is not set. For example, this can happen if VM is started or stopped not during migration and vfio_vmstate_change() error flow is taken, as MigrationState->to_dst_file is not set at that time. Fix it by checking that MigrationState->to_dst_file is set before using it. Fixes: 02a7e71b1e5b ("vfio: Add VM state change handler to know state of VM") Signed-off-by: Avihai Horon Reviewed-by: Juan Quintela Reviewed-by: Vladimir Sementsov-Ogievskiy --- hw/vfio/migration.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index e1413ac90c..09fe7c1de2 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -743,7 +743,9 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) */ error_report("%s: Failed to set device state 0x%x", vbasedev->name, (migration->device_state & mask) | value); - qemu_file_set_error(migrate_get_current()->to_dst_file, ret); + if (migrate_get_current()->to_dst_file) { + qemu_file_set_error(migrate_get_current()->to_dst_file, ret); + } } vbasedev->migration->vm_running = running; trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),