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Thu, 7 Oct 2021 12:24:43 +0000 From: Ioana Ciornei To: Laurentiu Tudor CC: "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Leo Li , "Youri Querry (OSS)" Subject: Re: [PATCH v2] soc: dpio: fix cleanup on error Thread-Topic: [PATCH v2] soc: dpio: fix cleanup on error Thread-Index: AQHXuRZ0VfjSBnS31kCsmuq7g1DGlavHem8A Date: Thu, 7 Oct 2021 12:24:43 +0000 Message-ID: <20211007122442.4nyof6jf3w6s4shy@skbuf> References: <20211004115323.7454-1-laurentiu.tudor@nxp.com> In-Reply-To: <20211004115323.7454-1-laurentiu.tudor@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: nxp.com; dkim=none (message not signed) header.d=none;nxp.com; dmarc=none action=none header.from=nxp.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 776a21da-4abd-46b3-ed40-08d9898d717b x-ms-traffictypediagnostic: AM8PR04MB7812: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6430; 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charset="us-ascii" Content-ID: <80523CB512837B4B89E94F2E53BA4322@eurprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM4PR0401MB2308.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 776a21da-4abd-46b3-ed40-08d9898d717b X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Oct 2021 12:24:43.5247 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: lULZDIb1AHIKTe8zZBmByJ1YIPu5gmNniBe6UQNjxWo8NDvJNIiW9nYh/uz3EpxK8+wXt6/sTKA74BmSnk+W4A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR04MB7812 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 04, 2021 at 02:53:23PM +0300, Laurentiu Tudor wrote: > dpaa2_io_service_register() adds an element to a linked list but > doesn't remove it on the error path, leading to the below kasan > use-after-free splat. Fix it. >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: use-after-free in dpaa2_io_service_register+0xb8/0x1d4 > Write of size 8 at addr ffff05d2b13af028 by task kworker/u32:2/151 >=20 > CPU: 9 PID: 151 Comm: kworker/u32:2 Not tainted 5.14.0-rc1-00222 > Hardware name: NXP NXP LX2160ARDB Platform, BIOS EDK II Apr 16 2021 > Workqueue: events_unbound deferred_probe_work_func > Call trace: > dump_backtrace+0x0/0x2a4 > show_stack+0x1c/0x30 > dump_stack_lvl+0x68/0x84 > print_address_description.constprop.0+0x74/0x2b8 > kasan_report+0x1e0/0x24c > __asan_store8+0xa8/0xd0 > dpaa2_io_service_register+0xb8/0x1d4 > dpaa2_eth_probe+0x93c/0x21cc > fsl_mc_driver_probe+0x3c/0x80 > really_probe.part.0+0xec/0x480 > __driver_probe_device+0xd4/0x180 > driver_probe_device+0xf8/0x1e0 > __device_attach_driver+0x120/0x190 > bus_for_each_drv+0xec/0x15c > __device_attach+0x168/0x250 > device_initial_probe+0x18/0x24 > bus_probe_device+0xec/0x100 > deferred_probe_work_func+0xe8/0x130 > process_one_work+0x3b8/0x650 > worker_thread+0xa4/0x72c > kthread+0x1f8/0x210 > ret_from_fork+0x10/0x18 >=20 > Allocated by task 1192: > kasan_save_stack+0x2c/0x60 > __kasan_kmalloc+0x90/0xb4 > dpaa2_eth_probe+0x830/0x21cc > fsl_mc_driver_probe+0x3c/0x80 > really_probe.part.0+0xec/0x480 > __driver_probe_device+0xd4/0x180 > driver_probe_device+0xf8/0x1e0 > __device_attach_driver+0x120/0x190 > bus_for_each_drv+0xec/0x15c > __device_attach+0x168/0x250 > device_initial_probe+0x18/0x24 > bus_probe_device+0xec/0x100 > device_add+0x570/0xca0 > fsl_mc_device_add+0x360/0x8f0 > fsl_mc_obj_device_add+0x140/0x16c > dprc_scan_objects+0x2c4/0x480 > dprc_probe+0x48/0x17c > fsl_mc_driver_probe+0x3c/0x80 > really_probe.part.0+0xec/0x480 > __driver_probe_device+0xd4/0x180 > device_driver_attach+0x70/0xf0 > bind_store+0xf8/0x160 > drv_attr_store+0x50/0x6c > sysfs_kf_write+0x94/0xb0 > kernfs_fop_write_iter+0x19c/0x264 > new_sync_write+0x1c4/0x2bc > vfs_write+0x30c/0x390 > ksys_write+0xc4/0x170 > __arm64_sys_write+0x48/0x60 > invoke_syscall+0x60/0x190 > el0_svc_common+0x84/0x130 > do_el0_svc+0x88/0xa4 > el0_svc+0x24/0x34 > el0t_64_sync_handler+0xa8/0x130 > el0t_64_sync+0x198/0x19c >=20 > Freed by task 1192: > kasan_save_stack+0x2c/0x60 > kasan_set_track+0x2c/0x40 > kasan_set_free_info+0x2c/0x50 > __kasan_slab_free+0xdc/0x140 > kfree+0xd4/0x360 > dpaa2_eth_probe+0x11b4/0x21cc > fsl_mc_driver_probe+0x3c/0x80 > really_probe.part.0+0xec/0x480 > __driver_probe_device+0xd4/0x180 > driver_probe_device+0xf8/0x1e0 > __device_attach_driver+0x120/0x190 > bus_for_each_drv+0xec/0x15c > __device_attach+0x168/0x250 > device_initial_probe+0x18/0x24 > bus_probe_device+0xec/0x100 > device_add+0x570/0xca0 > fsl_mc_device_add+0x360/0x8f0 > fsl_mc_obj_device_add+0x140/0x16c > dprc_scan_objects+0x2c4/0x480 > dprc_probe+0x48/0x17c > fsl_mc_driver_probe+0x3c/0x80 > really_probe.part.0+0xec/0x480 > __driver_probe_device+0xd4/0x180 > device_driver_attach+0x70/0xf0 > bind_store+0xf8/0x160 > drv_attr_store+0x50/0x6c > sysfs_kf_write+0x94/0xb0 > kernfs_fop_write_iter+0x19c/0x264 > new_sync_write+0x1c4/0x2bc > vfs_write+0x30c/0x390 > ksys_write+0xc4/0x170 > __arm64_sys_write+0x48/0x60 > invoke_syscall+0x60/0x190 > el0_svc_common+0x84/0x130 > do_el0_svc+0x88/0xa4 > el0_svc+0x24/0x34 > el0t_64_sync_handler+0xa8/0x130 > el0t_64_sync+0x198/0x19c >=20 > The buggy address belongs to the object at ffff05d2b13af000 > which belongs to the cache kmalloc-1k of size 1024 > The buggy address is located 40 bytes inside of > 1024-byte region [ffff05d2b13af000, ffff05d2b13af400) > The buggy address belongs to the page: > page:0000000091873dc7 refcount:1 mapcount:0 mapping:0000000000000000 inde= x:0x0 pfn:0x22313a8 > head:0000000091873dc7 order:3 compound_mapcount:0 compound_pincount:0 > flags: 0xbfffc0000010200(slab|head|node=3D0|zone=3D2|lastcpupid=3D0xffff) > raw: 0bfffc0000010200 0000000000000000 dead000000000122 ffff05d1000028c0 > raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected >=20 > Memory state around the buggy address: > ffff05d2b13aef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff05d2b13aef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >ffff05d2b13af000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff05d2b13af080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff05d2b13af100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > Signed-off-by: Laurentiu Tudor Reviewed-by: Ioana Ciornei =