==================================================================
BUG: KASAN: slab-out-of-bounds in strlen+0x93/0xa0 lib/string.c:402
Read of size 1 at addr ffff888127772100 by task kworker/0:7/8461

CPU: 0 UID: 0 PID: 8461 Comm: kworker/0:7 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 strlen+0x93/0xa0 lib/string.c:402
 __fortify_strlen include/linux/fortify-string.h:218 [inline]
 drm_property_add_enum+0x2d/0x590 drivers/gpu/drm/drm_property.c:396
 drm_mode_create_tv_properties_legacy+0x3e9/0x4c0 drivers/gpu/drm/drm_connector.c:2242
 gud_connector_add_tv_mode+0x1d7/0x2b0 drivers/gpu/drm/gud/gud_connector.c:402
 gud_connector_add_properties drivers/gpu/drm/gud/gud_connector.c:525 [inline]
 gud_connector_create drivers/gpu/drm/gud/gud_connector.c:680 [inline]
 gud_get_connectors+0xbd9/0x1700 drivers/gpu/drm/gud/gud_connector.c:717
 gud_probe+0x17aa/0x1c20 drivers/gpu/drm/gud/gud_drv.c:635
 usb_probe_interface+0x386/0x9b0 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x64/0x160 drivers/base/bus.c:620
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x64/0x160 drivers/base/bus.c:620
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2708
 usb_new_device drivers/usb/core/hub.c:5833 [inline]
 hub_port_connect drivers/usb/core/hub.c:5580 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 port_event drivers/usb/core/hub.c:5884 [inline]
 hub_event.cold+0x51a/0xe9d drivers/usb/core/hub.c:5966
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387
 process_scheduled_works kernel/workqueue.c:3470 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 8461:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2d8/0x680 mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 gud_connector_add_tv_mode+0xac/0x2b0 drivers/gpu/drm/gud/gud_connector.c:385
 gud_connector_add_properties drivers/gpu/drm/gud/gud_connector.c:525 [inline]
 gud_connector_create drivers/gpu/drm/gud/gud_connector.c:680 [inline]
 gud_get_connectors+0xbd9/0x1700 drivers/gpu/drm/gud/gud_connector.c:717
 gud_probe+0x17aa/0x1c20 drivers/gpu/drm/gud/gud_drv.c:635
 usb_probe_interface+0x386/0x9b0 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x64/0x160 drivers/base/bus.c:620
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x64/0x160 drivers/base/bus.c:620
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2708
 usb_new_device drivers/usb/core/hub.c:5833 [inline]
 hub_port_connect drivers/usb/core/hub.c:5580 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 port_event drivers/usb/core/hub.c:5884 [inline]
 hub_event.cold+0x51a/0xe9d drivers/usb/core/hub.c:5966
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387
 process_scheduled_works kernel/workqueue.c:3470 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x69f/0xc90 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 ffff888127772000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes to the right of
 allocated 256-byte region [ffff888127772000, ffff888127772100)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888127772200 pfn:0x127772
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000240(workingset|head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000240 ffff888100041b40 ffff888100040708 ffffea000420c810
raw: ffff888127772200 0000000000100002 00000000f5000000 0000000000000000
head: 0200000000000240 ffff888100041b40 ffff888100040708 ffffea000420c810
head: ffff888127772200 0000000000100002 00000000f5000000 0000000000000000
head: 0200000000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2868, tgid 2868 (udevd), ts 635721011321
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0xf4b/0x3440 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2d7/0x2f70 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab mm/slub.c:3462 [inline]
 new_slab+0xa9/0x6e0 mm/slub.c:3513
 refill_objects+0xe3/0x410 mm/slub.c:7410
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __kmalloc_cache_noprof+0x4a1/0x680 mm/slub.c:5559
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 inode_doinit_use_xattr+0x54/0x330 security/selinux/hooks.c:1379
 inode_doinit_with_dentry+0x10fc/0x1340 security/selinux/hooks.c:1574
 selinux_d_instantiate+0x26/0x40 security/selinux/hooks.c:6685
 security_d_instantiate+0x62/0xc0 security/security.c:3703
 d_splice_alias_ops+0xd7/0x15b0 fs/dcache.c:3249
 kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1288
 __lookup_slow+0x155/0x320 fs/namei.c:1919
 lookup_slow+0x50/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x1377/0x1cc0 fs/namei.c:2656
page last free pid 1127 tgid 1127 ts 634457703537 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_pages_prepare+0x558/0xd20 mm/page_alloc.c:1463
 __free_contig_range_common.constprop.0+0x12c/0x230 mm/page_alloc.c:7072
 __free_contig_range mm/page_alloc.c:7117 [inline]
 free_pages_bulk+0xbb/0x1f0 mm/page_alloc.c:5322
 vm_area_free_pages+0xb2/0x2a0 mm/vmalloc.c:3461
 vfree mm/vmalloc.c:3510 [inline]
 vfree+0xf7/0x6d0 mm/vmalloc.c:3484
 dvb_usb_adapter_dvb_exit+0xac/0x240 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:225
 dvb_usb_adapter_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:128 [inline]
 dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline]
 dvb_usb_device_exit+0x24d/0x520 drivers/media/usb/dvb-usb/dvb-usb-init.c:338
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461
 device_remove drivers/base/dd.c:618 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:610
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
 device_del+0x376/0x9b0 drivers/base/core.c:3965
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478
 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2350
 hub_port_connect drivers/usb/core/hub.c:5420 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 port_event drivers/usb/core/hub.c:5884 [inline]
 hub_event+0x1d46/0x4510 drivers/usb/core/hub.c:5966
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387

Memory state around the buggy address:
 ffff888127772000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888127772080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888127772100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888127772180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888127772200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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