usb 1-1: USB disconnect, device number 2 ================================================================== BUG: KASAN: slab-use-after-free in roccat_disconnect+0x236/0x240 drivers/hid/hid-roccat.c:373 Read of size 4 at addr ffff888113528008 by task kworker/1:4/334 CPU: 1 UID: 0 PID: 334 Comm: kworker/1:4 Not tainted syzkaller #0 6d6f333215c564de92c741644a4b57c848379815 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:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 print_address_description+0x71/0x210 mm/kasan/report.c:377 print_report+0x4a/0x70 mm/kasan/report.c:481 kasan_report+0x162/0x1a0 mm/kasan/report.c:594 __asan_report_load4_noabort+0x18/0x20 mm/kasan/report_generic.c:380 roccat_disconnect+0x236/0x240 drivers/hid/hid-roccat.c:373 savu_remove_specials drivers/hid/hid-roccat-savu.c:110 [inline] savu_remove+0xf0/0x170 drivers/hid/hid-roccat-savu.c:150 hid_device_remove+0x293/0x400 drivers/hid/hid-core.c:-1 device_remove drivers/base/dd.c:567 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x4ad/0x830 drivers/base/dd.c:1295 device_release_driver+0x1d/0x30 drivers/base/dd.c:1318 bus_remove_device+0x34f/0x370 drivers/base/bus.c:583 device_del+0x583/0xcf0 drivers/base/core.c:3881 hid_remove_device drivers/hid/hid-core.c:3002 [inline] hid_destroy_device+0x6e/0x110 drivers/hid/hid-core.c:3022 usbhid_disconnect+0xa3/0xc0 drivers/hid/usbhid/hid-core.c:1478 usb_unbind_interface+0x2b0/0xa40 drivers/usb/core/driver.c:462 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x525/0x830 drivers/base/dd.c:1295 device_release_driver+0x1d/0x30 drivers/base/dd.c:1318 bus_remove_device+0x34f/0x370 drivers/base/bus.c:583 device_del+0x583/0xcf0 drivers/base/core.c:3881 usb_disable_device+0x3af/0x770 drivers/usb/core/message.c:1476 usb_disconnect+0x331/0x950 drivers/usb/core/hub.c:2353 hub_port_connect drivers/usb/core/hub.c:5414 [inline] hub_port_connect_change drivers/usb/core/hub.c:5714 [inline] port_event drivers/usb/core/hub.c:5878 [inline] hub_event+0x1ad5/0x4360 drivers/usb/core/hub.c:5960 process_one_work kernel/workqueue.c:3273 [inline] process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435 kthread+0x2c7/0x360 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 31: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396 kasan_kmalloc include/linux/kasan.h:261 [inline] __kmalloc_cache_noprof+0x23c/0x470 mm/slub.c:4428 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1117 [inline] roccat_connect+0x6a/0x540 drivers/hid/hid-roccat.c:306 savu_init_specials drivers/hid/hid-roccat-savu.c:84 [inline] savu_probe+0x1a7/0x3f0 drivers/hid/hid-roccat-savu.c:134 __hid_device_probe drivers/hid/hid-core.c:2760 [inline] hid_device_probe+0x2c8/0x690 drivers/hid/hid-core.c:2799 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2e1/0x8b0 drivers/base/dd.c:657 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459 __device_attach+0x2c4/0x3c0 drivers/base/dd.c:1029 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078 bus_probe_device+0x18b/0x270 drivers/base/bus.c:541 device_add+0x7fd/0xbf0 drivers/base/core.c:3692 hid_add_device+0x3c4/0x5a0 drivers/hid/hid-core.c:2945 usbhid_probe+0xdca/0x1310 drivers/hid/usbhid/hid-core.c:1451 usb_probe_interface+0x6a8/0xbf0 drivers/usb/core/driver.c:400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2e1/0x8b0 drivers/base/dd.c:657 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459 __device_attach+0x2c4/0x3c0 drivers/base/dd.c:1029 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078 bus_probe_device+0x18b/0x270 drivers/base/bus.c:541 device_add+0x7fd/0xbf0 drivers/base/core.c:3692 usb_set_configuration+0x1aad/0x2080 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254 usb_probe_device+0x1f2/0x3b0 drivers/usb/core/driver.c:295 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2e1/0x8b0 drivers/base/dd.c:657 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459 __device_attach+0x2c4/0x3c0 drivers/base/dd.c:1029 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078 bus_probe_device+0x18b/0x270 drivers/base/bus.c:541 device_add+0x7fd/0xbf0 drivers/base/core.c:3692 usb_new_device+0x98d/0x1500 drivers/usb/core/hub.c:2703 hub_port_connect drivers/usb/core/hub.c:5574 [inline] hub_port_connect_change drivers/usb/core/hub.c:5714 [inline] port_event drivers/usb/core/hub.c:5878 [inline] hub_event+0x2dbd/0x4360 drivers/usb/core/hub.c:5960 process_one_work kernel/workqueue.c:3273 [inline] process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435 kthread+0x2c7/0x360 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 318: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_free_info+0x44/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:249 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:266 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2445 [inline] slab_free mm/slub.c:4716 [inline] kfree+0x158/0x440 mm/slub.c:4877 roccat_release+0x2c3/0x390 drivers/hid/hid-roccat.c:229 __fput+0x20b/0xa30 fs/file_table.c:447 ____fput+0x20/0x30 fs/file_table.c:475 task_work_run+0x1e8/0x260 kernel/task_work.c:246 resume_user_mode_work+0x35/0x50 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x63/0xb0 kernel/entry/common.c:218 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84 entry_SYSCALL_64_after_hwframe+0x76/0x7e The buggy address belongs to the object at ffff888113528000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of freed 512-byte region [ffff888113528000, ffff888113528200) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113528 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4000000000000040(head|zone=1) page_type: f5(slab) raw: 4000000000000040 ffff888100041c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 4000000000000040 ffff888100041c80 dead000000000122 0000000000000000 head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 4000000000000002 ffffea00044d4a01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 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 31, tgid 31 (kworker/1:0), ts 24362691748, free_ts 24258988406 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1864 prep_new_page+0x2d/0x180 mm/page_alloc.c:1872 get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3949 __alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5316 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1 allocate_slab+0x69/0x430 mm/slub.c:2687 new_slab mm/slub.c:2741 [inline] ___slab_alloc+0x591/0x8c0 mm/slub.c:3934 __slab_alloc mm/slub.c:4025 [inline] __slab_alloc_node mm/slub.c:4078 [inline] slab_alloc_node mm/slub.c:4241 [inline] __kmalloc_cache_noprof+0x2cd/0x470 mm/slub.c:4423 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1117 [inline] roccat_connect+0x6a/0x540 drivers/hid/hid-roccat.c:306 savu_init_specials drivers/hid/hid-roccat-savu.c:84 [inline] savu_probe+0x1a7/0x3f0 drivers/hid/hid-roccat-savu.c:134 __hid_device_probe drivers/hid/hid-core.c:2760 [inline] hid_device_probe+0x2c8/0x690 drivers/hid/hid-core.c:2799 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2e1/0x8b0 drivers/base/dd.c:657 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459 page last free pid 318 tgid 318 stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1391 [inline] free_unref_page+0xb99/0xf50 mm/page_alloc.c:2877 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5403 __free_slab+0xb2/0x110 mm/slub.c:2758 free_slab+0x18/0xe0 mm/slub.c:2781 discard_slab mm/slub.c:2787 [inline] __put_partials+0x115/0x150 mm/slub.c:3256 put_cpu_partial+0x91/0xc0 mm/slub.c:3331 __slab_free+0x1cf/0x2a0 mm/slub.c:4586 do_slab_free mm/slub.c:4668 [inline] ___cache_free+0xc9/0xe0 mm/slub.c:4783 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:331 kasan_slab_alloc include/linux/kasan.h:251 [inline] slab_post_alloc_hook mm/slub.c:4204 [inline] slab_alloc_node mm/slub.c:4253 [inline] kmem_cache_alloc_noprof+0x1bf/0x410 mm/slub.c:4262 new_handle fs/jbd2/transaction.c:461 [inline] jbd2__journal_start+0x16d/0x860 fs/jbd2/transaction.c:488 __ext4_journal_start_sb+0x111/0x3f0 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x97/0x110 fs/ext4/inode.c:6107 __mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2542 Memory state around the buggy address: ffff888113527f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888113527f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888113528000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113528080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113528100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================