input: WideView WT-220U PenType Receiver (based on ZL353) as /devices/platform/dummy_hcd.0/usb1/1-1/rc/rc0/input5 dvb-usb: schedule remote query interval to 300 msecs. dvb-usb: WideView WT-220U PenType Receiver (based on ZL353) successfully initialized and connected. usb 1-1: USB disconnect, device number 2 ================================================================== BUG: KASAN: slab-use-after-free in media_devnode_unregister+0xe2/0xf0 drivers/media/mc/mc-devnode.c:284 Read of size 4 at addr ffff888144e904f0 by task kworker/1:2/980 CPU: 1 UID: 0 PID: 980 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 media_devnode_unregister+0xe2/0xf0 drivers/media/mc/mc-devnode.c:284 media_device_unregister+0x37c/0x400 drivers/media/mc/mc-device.c:828 dvb_usb_media_device_unregister drivers/media/usb/dvb-usb/dvb-usb-dvb.c:136 [inline] dvb_usb_adapter_dvb_exit+0xf3/0x1b0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:226 dvb_usb_adapter_exit+0x8b/0x240 drivers/media/usb/dvb-usb/dvb-usb-init.c:128 dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline] dvb_usb_device_exit+0x1b6/0x350 drivers/media/usb/dvb-usb/dvb-usb-init.c:338 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:571 [inline] __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x4d6/0x800 drivers/base/dd.c:1297 bus_remove_device+0x34d/0x410 drivers/base/bus.c:579 device_del+0x511/0x8e0 drivers/base/core.c:3878 usb_disable_device+0x3e9/0x8a0 drivers/usb/core/message.c:1418 usb_disconnect+0x330/0x950 drivers/usb/core/hub.c:2344 hub_port_connect drivers/usb/core/hub.c:5406 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x1cf5/0x4a20 drivers/usb/core/hub.c:5952 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 980: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5397 kmalloc_noprof include/linux/slab.h:956 [inline] kzalloc_noprof include/linux/slab.h:1090 [inline] __media_device_register+0x58/0x280 drivers/media/mc/mc-device.c:720 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [inline] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline] dvb_usb_device_init+0x1bed/0x2580 drivers/media/usb/dvb-usb/dvb-usb-init.c:310 dtt200u_usb_probe+0xb5/0x120 drivers/media/usb/dvb-usb/dtt200u.c:152 usb_probe_interface+0x665/0xc30 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26a/0x9e0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 bus_probe_device+0x185/0x260 drivers/base/bus.c:537 device_add+0x7b6/0xb50 drivers/base/core.c:3689 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c1/0x390 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26a/0x9e0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031 bus_probe_device+0x185/0x260 drivers/base/bus.c:537 device_add+0x7b6/0xb50 drivers/base/core.c:3689 usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694 hub_port_connect drivers/usb/core/hub.c:5566 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 980: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2484 [inline] slab_free mm/slub.c:6121 [inline] kfree+0x199/0x6d0 mm/slub.c:6329 media_devnode_release+0x61/0xa0 drivers/media/mc/mc-devnode.c:57 device_release+0x9c/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x228/0x480 lib/kobject.c:737 media_devnode_unregister+0x6d/0xf0 drivers/media/mc/mc-devnode.c:281 media_device_unregister+0x37c/0x400 drivers/media/mc/mc-device.c:828 dvb_usb_media_device_unregister drivers/media/usb/dvb-usb/dvb-usb-dvb.c:136 [inline] dvb_usb_adapter_dvb_exit+0xf3/0x1b0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:226 dvb_usb_adapter_exit+0x8b/0x240 drivers/media/usb/dvb-usb/dvb-usb-init.c:128 dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline] dvb_usb_device_exit+0x1b6/0x350 drivers/media/usb/dvb-usb/dvb-usb-init.c:338 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:571 [inline] __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x4d6/0x800 drivers/base/dd.c:1297 bus_remove_device+0x34d/0x410 drivers/base/bus.c:579 device_del+0x511/0x8e0 drivers/base/core.c:3878 usb_disable_device+0x3e9/0x8a0 drivers/usb/core/message.c:1418 usb_disconnect+0x330/0x950 drivers/usb/core/hub.c:2344 hub_port_connect drivers/usb/core/hub.c:5406 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x1cf5/0x4a20 drivers/usb/core/hub.c:5952 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888144e90000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1264 bytes inside of freed 2048-byte region [ffff888144e90000, ffff888144e90800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x144e90 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000040 ffff88801a842000 ffffea000512b600 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 057ff00000000040 ffff88801a842000 ffffea000512b600 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 057ff00000000003 ffffea000513a401 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 4002246788, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3863 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5153 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2996 [inline] allocate_slab+0x8a/0x330 mm/slub.c:3164 new_slab mm/slub.c:3218 [inline] ___slab_alloc+0xbd1/0x13f0 mm/slub.c:4420 __slab_alloc+0x55/0xa0 mm/slub.c:4511 __slab_alloc_node mm/slub.c:4586 [inline] slab_alloc_node mm/slub.c:4996 [inline] __kmalloc_cache_noprof+0x411/0x6f0 mm/slub.c:5392 kmalloc_noprof include/linux/slab.h:956 [inline] kzalloc_noprof include/linux/slab.h:1090 [inline] acpi_ds_create_walk_state+0xd9/0x270 drivers/acpi/acpica/dswstate.c:518 acpi_ps_execute_method+0x220/0x7c0 drivers/acpi/acpica/psxface.c:134 acpi_ns_evaluate+0x5a6/0xa20 drivers/acpi/acpica/nseval.c:205 acpi_evaluate_object+0x53f/0xa10 drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0xfc/0x270 drivers/acpi/utils.c:260 acpi_bus_get_status_handle drivers/acpi/bus.c:82 [inline] acpi_bus_get_status+0x14a/0x380 drivers/acpi/bus.c:111 acpi_bus_attach+0x232/0xbb0 drivers/acpi/scan.c:2283 device_for_each_child+0x103/0x190 drivers/base/core.c:4018 page_owner free stack trace missing Memory state around the buggy address: ffff888144e90380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888144e90400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888144e90480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888144e90500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888144e90580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================