================================================================== BUG: KASAN: use-after-free in strrchr+0x5c/0x70 lib/string.c:488 Read of size 1 at addr ffff88811b205d78 by task kworker/1:3/307 CPU: 1 PID: 307 Comm: kworker/1:3 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+0x21/0x24 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 52: 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 52: 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 ffff88811b204000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7544 bytes inside of 8192-byte region [ffff88811b204000, ffff88811b206000) The buggy address belongs to the page: page:ffffea00046c8000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b200 head:ffffea00046c8000 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 20, ts 39981613761, free_ts 39981256332 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] 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_compound_page+0x73/0x90 mm/page_alloc.c:710 destroy_compound_page include/linux/mm.h:970 [inline] __put_compound_page+0x77/0xb0 mm/swap.c:117 __put_page+0xbd/0xe0 mm/swap.c:133 put_page include/linux/mm.h:1268 [inline] page_to_skb+0x3d9/0x930 drivers/net/virtio_net.c:473 receive_mergeable drivers/net/virtio_net.c:1049 [inline] receive_buf+0xc03/0x46a0 drivers/net/virtio_net.c:1159 virtnet_receive drivers/net/virtio_net.c:1451 [inline] virtnet_poll+0x56b/0xfa0 drivers/net/virtio_net.c:1563 napi_poll net/core/dev.c:6885 [inline] net_rx_action+0x48d/0xed0 net/core/dev.c:6955 __do_softirq+0x255/0x563 kernel/softirq.c:309 Memory state around the buggy address: ffff88811b205c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811b205c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811b205d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811b205d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811b205e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== wacom 0003:056A:0084.0050: hidraw0: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input1 usbhid 3-1:1.2: can't add hid device: -71 usbhid: probe of 3-1:1.2 failed with error -71 usb 3-1: USB disconnect, device number 9 usb 3-1: new high-speed USB device number 10 using dummy_hcd usb 3-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.0056: hidraw5: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input0 wacom 0003:056A:0084.005A: hidraw7: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input1 usbhid 3-1:1.2: can't add hid device: -71 usbhid: probe of 3-1:1.2 failed with error -71 usb 3-1: USB disconnect, device number 10 usb 3-1: new high-speed USB device number 11 using dummy_hcd usb 3-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.0060: hidraw5: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input0 wacom 0003:056A:0084.0064: hidraw7: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input1 usbhid 3-1:1.2: can't add hid device: -71 usbhid: probe of 3-1:1.2 failed with error -71 usb 3-1: USB disconnect, device number 11 usb 3-1: new high-speed USB device number 12 using dummy_hcd usb 3-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.006A: hidraw5: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input0 wacom 0003:056A:0084.006E: hidraw7: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input1 usbhid 3-1:1.2: can't add hid device: -71 usbhid: probe of 3-1:1.2 failed with error -71 usb 3-1: USB disconnect, device number 12 usb 3-1: new high-speed USB device number 13 using dummy_hcd usb 3-1: New USB device found, idVendor=056a, idProduct=0084, bcdDevice= 1.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 wacom 0003:056A:0084.0074: hidraw5: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input0 wacom 0003:056A:0084.0078: hidraw7: USB HID v1.10 Device [HID 056a:0084] on usb-dummy_hcd.2-1/input1 usbhid 3-1:1.2: can't add hid device: -71 usbhid: probe of 3-1:1.2 failed with error -71 usb 3-1: USB disconnect, device number 13 usb 3-1: new high-speed USB device number 14 using dummy_hcd