==================================================================
BUG: KASAN: use-after-free in strrchr+0x5c/0x70 lib/string.c:488
Read of size 1 at addr ffff88811a721d78 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 strrchr+0x5c/0x70 lib/string.c:488
 hid_compare_device_paths+0x43/0xb0 drivers/hid/hid-core.c:2311
 wacom_get_hdev_data drivers/hid/wacom_sys.c:831 [inline]
 wacom_add_shared_data drivers/hid/wacom_sys.c:889 [inline]
 wacom_parse_and_register+0x4efa/0x6d20 drivers/hid/wacom_sys.c:2403
 wacom_probe+0x76b/0x950 drivers/hid/wacom_sys.c:2855
 hid_device_probe+0x28d/0x390 drivers/hid/hid-core.c:2363
 really_probe+0x373/0xa60 drivers/base/dd.c:558
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 hid_add_device+0x349/0x4b0 drivers/hid/hid-core.c:2515
 usbhid_probe+0xb93/0xf30 drivers/hid/usbhid/hid-core.c:1436
 usb_probe_interface+0x60f/0xb20 drivers/usb/core/driver.c:397
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_set_configuration+0x1a76/0x1fe0 drivers/usb/core/message.c:2219
 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x143/0x250 drivers/usb/core/driver.c:294
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_new_device+0x9ba/0x1460 drivers/usb/core/hub.c:2659
 hub_port_connect drivers/usb/core/hub.c:5504 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5644 [inline]
 port_event drivers/usb/core/hub.c:5810 [inline]
 hub_event+0x2790/0x4220 drivers/usb/core/hub.c:5892
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 process_scheduled_works kernel/workqueue.c:2363 [inline]
 worker_thread+0xd1c/0x13c0 kernel/workqueue.c:2449
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Allocated by task 15:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 ____kasan_kmalloc mm/kasan/common.c:509 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:667 [inline]
 hid_allocate_device+0x50/0x2f0 drivers/hid/hid-core.c:2539
 usbhid_probe+0x3c7/0xf30 drivers/hid/usbhid/hid-core.c:1370
 usb_probe_interface+0x60f/0xb20 drivers/usb/core/driver.c:397
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_set_configuration+0x1a76/0x1fe0 drivers/usb/core/message.c:2219
 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x143/0x250 drivers/usb/core/driver.c:294
 really_probe+0x3bf/0xa60 drivers/base/dd.c:562
 driver_probe_device+0xe1/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x282/0x3f0 drivers/base/dd.c:863
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:433
 __device_attach+0x2a8/0x410 drivers/base/dd.c:932
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:981
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:493
 device_add+0x8ce/0xc00 drivers/base/core.c:3273
 usb_new_device+0x9ba/0x1460 drivers/usb/core/hub.c:2659
 hub_port_connect drivers/usb/core/hub.c:5504 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5644 [inline]
 port_event drivers/usb/core/hub.c:5810 [inline]
 hub_event+0x2790/0x4220 drivers/usb/core/hub.c:5892
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 process_scheduled_works kernel/workqueue.c:2363 [inline]
 worker_thread+0xd1c/0x13c0 kernel/workqueue.c:2449
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 15:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kfree+0xc0/0x270 mm/slub.c:4196
 hid_device_release+0x4b/0x50 drivers/hid/hid-core.c:718
 device_release+0x96/0x1c0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:713 [inline]
 kobject_release lib/kobject.c:744 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x18a/0x270 lib/kobject.c:761
 put_device+0x1f/0x30 drivers/base/core.c:3373
 hid_destroy_device+0xe3/0x110 drivers/hid/hid-core.c:2583
 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1463
 usb_unbind_interface+0x212/0x8a0 drivers/usb/core/driver.c:459
 __device_release_driver drivers/base/dd.c:-1 [inline]
 device_release_driver_internal+0x531/0x7c0 drivers/base/dd.c:1221
 device_release_driver+0x19/0x20 drivers/base/dd.c:1244
 bus_remove_device+0x2df/0x340 drivers/base/bus.c:535
 device_del+0x62e/0xe60 drivers/base/core.c:3453
 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1470
 usb_disconnect+0x32d/0x870 drivers/usb/core/hub.c:2315
 hub_port_connect drivers/usb/core/hub.c:5343 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5644 [inline]
 port_event drivers/usb/core/hub.c:5810 [inline]
 hub_event+0x19c2/0x4220 drivers/usb/core/hub.c:5892
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 process_scheduled_works kernel/workqueue.c:2363 [inline]
 worker_thread+0xd1c/0x13c0 kernel/workqueue.c:2449
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff88811a720000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 7544 bytes inside of
 8192-byte region [ffff88811a720000, ffff88811a722000)
The buggy address belongs to the page:
page:ffffea000469c800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a720
head:ffffea000469c800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042a80
raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 136, ts 4693280350, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc_trace+0x1a8/0x2e0 mm/slub.c:2977
 kmalloc include/linux/slab.h:555 [inline]
 audit_log_d_path+0xa2/0x200 kernel/audit.c:2170
 dump_common_audit_data security/lsm_audit.c:364 [inline]
 common_lsm_audit+0xec8/0x1850 security/lsm_audit.c:466
 slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:798
 avc_audit security/selinux/include/avc.h:140 [inline]
 avc_has_perm+0x215/0x3d0 security/selinux/avc.c:1201
 sock_has_perm security/selinux/hooks.c:4601 [inline]
 selinux_socket_listen+0x22f/0x340 security/selinux/hooks.c:4923
 security_socket_listen+0x69/0xa0 security/security.c:2149
 __sys_listen net/socket.c:1698 [inline]
 __do_sys_listen net/socket.c:1709 [inline]
 __se_sys_listen net/socket.c:1707 [inline]
 __x64_sys_listen+0x189/0x290 net/socket.c:1707
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811a721c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811a721c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811a721d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff88811a721d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811a721e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
wacom 0003:056A:0084.0059: hidraw3: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input0
wacom 0003:056A:0084.0060: hidraw6: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input1
usbhid 1-1:1.2: can't add hid device: -71
usbhid: probe of 1-1:1.2 failed with error -71
usb 1-1: USB disconnect, device number 10
usb 1-1: new high-speed USB device number 11 using dummy_hcd
usb 1-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: unknown main item tag 0x0
wacom 0003:056A:0084.0066: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input0
wacom 0003:056A:0084.0068: hidraw3: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input1
usbhid 1-1:1.2: can't add hid device: -71
usbhid: probe of 1-1:1.2 failed with error -71
usb 1-1: USB disconnect, device number 11
usb 1-1: new high-speed USB device number 12 using dummy_hcd
usb 1-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: unknown main item tag 0x0
wacom 0003:056A:0084.0071: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input0
wacom 0003:056A:0084.0072: hidraw3: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input1
usbhid 1-1:1.2: can't add hid device: -71
usbhid: probe of 1-1:1.2 failed with error -71
usb 1-1: USB disconnect, device number 12
usb 1-1: new high-speed USB device number 13 using dummy_hcd
usb 1-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: unknown main item tag 0x0
wacom 0003:056A:0084.007A: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.0-1/input0