dvb-usb: schedule remote query interval to 150 msecs.
dw2102: su3000_power_ctrl: 0, initialized 1
dvb-usb: TeVii S421 PCI successfully initialized and connected.
usb 2-1: USB disconnect, device number 34
==================================================================
BUG: KASAN: use-after-free in dvb_usb_device_exit+0x274/0x280 drivers/media/usb/dvb-usb/dvb-usb-init.c:305
Read of size 8 at addr ffff88802b7f22e8 by task kworker/1:0/9925

CPU: 1 PID: 9925 Comm: kworker/1:0 Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:397 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:414
 dvb_usb_device_exit+0x274/0x280 drivers/media/usb/dvb-usb/dvb-usb-init.c:305
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1156
 device_release_driver_internal drivers/base/dd.c:1187 [inline]
 device_release_driver+0x26/0x40 drivers/base/dd.c:1210
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x502/0xd40 drivers/base/core.c:3345
 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1413
 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2218
 hub_port_connect drivers/usb/core/hub.c:5074 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
 port_event drivers/usb/core/hub.c:5509 [inline]
 hub_event+0x1c8a/0x42d0 drivers/usb/core/hub.c:5591
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 process_scheduled_works kernel/workqueue.c:2337 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2423
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Allocated by task 9925:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:403 [inline]
 ____kasan_kmalloc mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406
 kasan_slab_alloc include/linux/kasan.h:208 [inline]
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slub.c:2910 [inline]
 slab_alloc mm/slub.c:2918 [inline]
 __kmalloc_track_caller+0x163/0x2e0 mm/slub.c:4553
 kmemdup+0x23/0x50 mm/util.c:128
 kmemdup include/linux/fortify-string.h:270 [inline]
 dw2102_probe+0x57c/0xb10 drivers/media/usb/dvb-usb/dw2102.c:2436
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xe60 drivers/base/dd.c:554
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:914
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbdb/0x1db0 drivers/base/core.c:3166
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xe60 drivers/base/dd.c:554
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:914
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbdb/0x1db0 drivers/base/core.c:3166
 usb_new_device.cold+0x725/0x1057 drivers/usb/core/hub.c:2555
 hub_port_connect drivers/usb/core/hub.c:5223 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
 port_event drivers/usb/core/hub.c:5509 [inline]
 hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Freed by task 9925:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free.part.0+0xe1/0x110 mm/kasan/common.c:364
 kasan_slab_free include/linux/kasan.h:191 [inline]
 slab_free_hook mm/slub.c:1565 [inline]
 slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1603
 slab_free mm/slub.c:3164 [inline]
 kfree+0xe5/0x7b0 mm/slub.c:4205
 dw2102_probe+0x782/0xb10 drivers/media/usb/dvb-usb/dw2102.c:2470
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xe60 drivers/base/dd.c:554
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:914
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbdb/0x1db0 drivers/base/core.c:3166
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xe60 drivers/base/dd.c:554
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4a0 drivers/base/dd.c:914
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbdb/0x1db0 drivers/base/core.c:3166
 usb_new_device.cold+0x725/0x1057 drivers/usb/core/hub.c:2555
 hub_port_connect drivers/usb/core/hub.c:5223 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
 port_event drivers/usb/core/hub.c:5509 [inline]
 hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the object at ffff88802b7f2000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 744 bytes inside of
 4096-byte region [ffff88802b7f2000, ffff88802b7f3000)
The buggy address belongs to the page:
page:00000000430bce0a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b7f0
head:00000000430bce0a order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888010042140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88802b7f2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802b7f2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802b7f2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88802b7f2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802b7f2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================