usb 1-1: USB disconnect, device number 8 ================================================================== BUG: KASAN: use-after-free in roccat_disconnect+0x22d/0x240 drivers/hid/hid-roccat.c:373 Read of size 4 at addr ffff88812ca12408 by task kworker/0:0/6 CPU: 0 PID: 6 Comm: kworker/0:0 Tainted: G W 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:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 roccat_disconnect+0x22d/0x240 drivers/hid/hid-roccat.c:373 savu_remove_specials drivers/hid/hid-roccat-savu.c:107 [inline] savu_remove+0xec/0x170 drivers/hid/hid-roccat-savu.c:147 hid_device_remove+0x292/0x3c0 drivers/hid/hid-core.c:-1 device_remove drivers/base/dd.c:548 [inline] __device_release_driver drivers/base/dd.c:1283 [inline] device_release_driver_internal+0x486/0x7e0 drivers/base/dd.c:1309 device_release_driver+0x19/0x20 drivers/base/dd.c:1332 bus_remove_device+0x2f0/0x350 drivers/base/bus.c:531 device_del+0x63c/0xe50 drivers/base/core.c:3886 hid_remove_device drivers/hid/hid-core.c:2872 [inline] hid_destroy_device+0x6a/0x110 drivers/hid/hid-core.c:2891 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1469 usb_unbind_interface+0x223/0x8b0 drivers/usb/core/driver.c:459 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1283 [inline] device_release_driver_internal+0x4e4/0x7e0 drivers/base/dd.c:1309 device_release_driver+0x19/0x20 drivers/base/dd.c:1332 bus_remove_device+0x2f0/0x350 drivers/base/bus.c:531 device_del+0x63c/0xe50 drivers/base/core.c:3886 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1472 usb_disconnect+0x32d/0x880 drivers/usb/core/hub.c:2339 hub_port_connect drivers/usb/core/hub.c:5433 [inline] hub_port_connect_change drivers/usb/core/hub.c:5734 [inline] port_event drivers/usb/core/hub.c:5898 [inline] hub_event+0x1a66/0x4310 drivers/usb/core/hub.c:5980 process_one_work+0x717/0xc30 kernel/workqueue.c:2302 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 4469: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] roccat_connect+0x5c/0x4b0 drivers/hid/hid-roccat.c:306 savu_init_specials drivers/hid/hid-roccat-savu.c:81 [inline] savu_probe+0x1ba/0x360 drivers/hid/hid-roccat-savu.c:131 hid_device_probe+0x267/0x3a0 drivers/hid/hid-core.c:2672 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2d7/0x9a0 drivers/base/dd.c:639 __driver_probe_device+0x193/0x270 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x192/0x220 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb0b/0xec0 drivers/base/core.c:3698 hid_add_device+0x3b8/0x580 drivers/hid/hid-core.c:2824 usbhid_probe+0xc12/0xff0 drivers/hid/usbhid/hid-core.c:1442 usb_probe_interface+0x621/0xb30 drivers/usb/core/driver.c:397 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2d7/0x9a0 drivers/base/dd.c:639 __driver_probe_device+0x193/0x270 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x192/0x220 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb0b/0xec0 drivers/base/core.c:3698 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+0x154/0x260 drivers/usb/core/driver.c:294 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2d7/0x9a0 drivers/base/dd.c:639 __driver_probe_device+0x193/0x270 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966 bus_for_each_drv+0x192/0x220 drivers/base/bus.c:429 __device_attach+0x2b0/0x420 drivers/base/dd.c:1038 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087 bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489 device_add+0xb0b/0xec0 drivers/base/core.c:3698 usb_new_device+0x9f4/0x1500 drivers/usb/core/hub.c:2684 hub_port_connect drivers/usb/core/hub.c:5594 [inline] hub_port_connect_change drivers/usb/core/hub.c:5734 [inline] port_event drivers/usb/core/hub.c:5898 [inline] hub_event+0x27fb/0x4310 drivers/usb/core/hub.c:5980 process_one_work+0x717/0xc30 kernel/workqueue.c:2302 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 4528: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728 kfree+0x6f/0xf0 mm/slab_common.c:990 roccat_release+0x2bc/0x380 drivers/hid/hid-roccat.c:229 __fput+0x1fd/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88812ca12400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88812ca12400, ffff88812ca12600) The buggy address belongs to the physical page: page:ffffea0004b28400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12ca10 head:ffffea0004b28400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3505, tgid 3505 (syz-executor), ts 134336546835, free_ts 125381296064 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node+0xa2/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] kzalloc_node include/linux/slab.h:710 [inline] qdisc_alloc+0x82/0x750 net/sched/sch_generic.c:951 qdisc_create_dflt+0x6b/0x3a0 net/sched/sch_generic.c:1009 attach_one_default_qdisc net/sched/sch_generic.c:1172 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2504 [inline] attach_default_qdiscs net/sched/sch_generic.c:1190 [inline] dev_activate+0x30e/0x1110 net/sched/sch_generic.c:1249 __dev_open+0x40d/0x520 net/core/dev.c:1518 __dev_change_flags+0x1f2/0x6b0 net/core/dev.c:8693 dev_change_flags+0x80/0x1a0 net/core/dev.c:8764 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page+0x93/0x530 mm/page_alloc.c:3720 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6021 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739 __vfree mm/vmalloc.c:2788 [inline] vfree+0x61/0x90 mm/vmalloc.c:2819 kcov_put kernel/kcov.c:437 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:533 __fput+0x1fd/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0xb0d/0x29f0 kernel/exit.c:896 do_group_exit+0x21b/0x2e0 kernel/exit.c:1040 get_signal+0x167c/0x1700 kernel/signal.c:2904 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 Memory state around the buggy address: ffff88812ca12300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88812ca12380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88812ca12400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88812ca12480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812ca12500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================