================================================================== BUG: KASAN: use-after-free in strrchr+0x5c/0x70 lib/string.c:501 Read of size 1 at addr ffff88811aa05d80 by task kworker/1:0/26 CPU: 1 PID: 26 Comm: kworker/1:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 strrchr+0x5c/0x70 lib/string.c:501 hid_compare_device_paths+0x43/0xb0 drivers/hid/hid-core.c:2311 wacom_get_hdev_data drivers/hid/wacom_sys.c:832 [inline] wacom_add_shared_data drivers/hid/wacom_sys.c:890 [inline] wacom_parse_and_register+0x4efa/0x6d20 drivers/hid/wacom_sys.c:2410 wacom_probe+0x767/0x980 drivers/hid/wacom_sys.c:2862 hid_device_probe+0x28d/0x390 drivers/hid/hid-core.c:2363 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x27d/0x970 drivers/base/dd.c:595 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:979 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489 device_add+0xaef/0xe90 drivers/base/core.c:3422 hid_add_device+0x349/0x4b0 drivers/hid/hid-core.c:2513 usbhid_probe+0xb93/0xf30 drivers/hid/usbhid/hid-core.c:1442 usb_probe_interface+0x60f/0xb20 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x27d/0x970 drivers/base/dd.c:595 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:979 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489 device_add+0xaef/0xe90 drivers/base/core.c:3422 usb_set_configuration+0x1a01/0x1f70 drivers/usb/core/message.c:2223 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x143/0x250 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x27d/0x970 drivers/base/dd.c:595 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:979 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489 device_add+0xaef/0xe90 drivers/base/core.c:3422 usb_new_device+0xa1f/0x1720 drivers/usb/core/hub.c:2643 hub_port_connect drivers/usb/core/hub.c:5560 [inline] hub_port_connect_change drivers/usb/core/hub.c:5700 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x291b/0x43f0 drivers/usb/core/hub.c:5948 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 process_scheduled_works kernel/workqueue.c:2391 [inline] worker_thread+0xd4c/0x1250 kernel/workqueue.c:2477 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 318: 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:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3274 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] hid_allocate_device+0x50/0x2f0 drivers/hid/hid-core.c:2537 usbhid_probe+0x3c7/0xf30 drivers/hid/usbhid/hid-core.c:1376 usb_probe_interface+0x60f/0xb20 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x27d/0x970 drivers/base/dd.c:595 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:979 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489 device_add+0xaef/0xe90 drivers/base/core.c:3422 usb_set_configuration+0x1a01/0x1f70 drivers/usb/core/message.c:2223 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x143/0x250 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x27d/0x970 drivers/base/dd.c:595 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:979 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1028 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:489 device_add+0xaef/0xe90 drivers/base/core.c:3422 usb_new_device+0xa1f/0x1720 drivers/usb/core/hub.c:2643 hub_port_connect drivers/usb/core/hub.c:5560 [inline] hub_port_connect_change drivers/usb/core/hub.c:5700 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x291b/0x43f0 drivers/usb/core/hub.c:5948 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 process_scheduled_works kernel/workqueue.c:2391 [inline] worker_thread+0xd4c/0x1250 kernel/workqueue.c:2477 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Freed by task 318: 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:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 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:3530 hid_destroy_device+0xe3/0x110 drivers/hid/hid-core.c:2581 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1469 usb_unbind_interface+0x212/0x8a0 drivers/usb/core/driver.c:458 __device_release_driver drivers/base/dd.c:1229 [inline] device_release_driver_internal+0x536/0x7c0 drivers/base/dd.c:1262 device_release_driver+0x19/0x20 drivers/base/dd.c:1285 bus_remove_device+0x2df/0x340 drivers/base/bus.c:531 device_del+0x62e/0xe20 drivers/base/core.c:3610 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1472 usb_disconnect+0x32d/0x870 drivers/usb/core/hub.c:2293 hub_port_connect drivers/usb/core/hub.c:5399 [inline] hub_port_connect_change drivers/usb/core/hub.c:5700 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x19b0/0x43f0 drivers/usb/core/hub.c:5948 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 process_scheduled_works kernel/workqueue.c:2391 [inline] worker_thread+0xd4c/0x1250 kernel/workqueue.c:2477 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff88811aa04000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7552 bytes inside of 8192-byte region [ffff88811aa04000, ffff88811aa06000) The buggy address belongs to the page: page:ffffea00046a8000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11aa00 head:ffffea00046a8000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043500 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 133, ts 4801360946, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2610 prep_new_page+0x1c/0x110 mm/page_alloc.c:2616 get_page_from_freelist+0x2d42/0x2dd0 mm/page_alloc.c:4492 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5829 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] audit_log_d_path+0xc6/0x240 kernel/audit.c:2173 dump_common_audit_data security/lsm_audit.c:248 [inline] common_lsm_audit+0x322/0x1670 security/lsm_audit.c:466 slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:802 avc_audit security/selinux/include/avc.h:135 [inline] avc_has_perm+0x1fb/0x250 security/selinux/avc.c:1193 inode_has_perm security/selinux/hooks.c:1711 [inline] file_has_perm+0x52d/0x700 security/selinux/hooks.c:1803 match_file+0xc8/0x130 security/selinux/hooks.c:2474 iterate_fd+0x113/0x1e0 fs/file.c:1324 flush_unauthorized_files security/selinux/hooks.c:2511 [inline] selinux_bprm_committing_creds+0x3df/0x8b0 security/selinux/hooks.c:2540 page_owner free stack trace missing Memory state around the buggy address: ffff88811aa05c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811aa05d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811aa05d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811aa05e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811aa05e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== wacom 0003:056A:0084.00C0: hidraw2: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input1 usbhid 5-1:1.2: can't add hid device: -71 usbhid: probe of 5-1:1.2 failed with error -71 usb 5-1: USB disconnect, device number 21 usb 5-1: new high-speed USB device number 22 using dummy_hcd usb 5-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: unknown main item tag 0x0 wacom 0003:056A:0084.00C6: hidraw2: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input0 wacom 0003:056A:0084.00CA: hidraw4: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input1 usbhid 5-1:1.2: can't add hid device: -71 usbhid: probe of 5-1:1.2 failed with error -71 usb 5-1: USB disconnect, device number 22 usb 5-1: new high-speed USB device number 23 using dummy_hcd usb 5-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: unknown main item tag 0x0 wacom 0003:056A:0084.00D1: hidraw1: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input0 wacom 0003:056A:0084.00D4: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input1 usbhid 5-1:1.2: can't add hid device: -71 usbhid: probe of 5-1:1.2 failed with error -71 usb 5-1: USB disconnect, device number 23 usb 5-1: new high-speed USB device number 24 using dummy_hcd usb 5-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: unknown main item tag 0x0 wacom 0003:056A:0084.00DB: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input0 wacom 0003:056A:0084.00DE: hidraw2: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.4-1/input1 usbhid 5-1:1.2: can't add hid device: -71 usbhid: probe of 5-1:1.2 failed with error -71 usb 5-1: USB disconnect, device number 24 usb 5-1: new high-speed USB device number 25 using dummy_hcd usb 5-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0