usb 4-1: 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 ffff888112776008 by task kworker/1:2/60 CPU: 1 PID: 60 Comm: kworker/1:2 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 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+0x272/0x3a0 drivers/hid/hid-core.c:-1 __device_release_driver drivers/base/dd.c:1227 [inline] device_release_driver_internal+0x4e8/0x7c0 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 hid_remove_device drivers/hid/hid-core.c:2547 [inline] hid_destroy_device+0x6a/0x110 drivers/hid/hid-core.c:2566 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:2288 hub_port_connect drivers/usb/core/hub.c:5394 [inline] hub_port_connect_change drivers/usb/core/hub.c:5695 [inline] port_event drivers/usb/core/hub.c:5861 [inline] hub_event+0x19b0/0x43f0 drivers/usb/core/hub.c:5943 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 321: 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] 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+0x28d/0x390 drivers/hid/hid-core.c:2349 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:2499 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:2638 hub_port_connect drivers/usb/core/hub.c:5555 [inline] hub_port_connect_change drivers/usb/core/hub.c:5695 [inline] port_event drivers/usb/core/hub.c:5861 [inline] hub_event+0x291b/0x43f0 drivers/usb/core/hub.c:5943 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Freed by task 383: 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 roccat_release+0x2ae/0x370 drivers/hid/hid-roccat.c:229 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xb70/0x29a0 kernel/exit.c:896 do_group_exit+0x149/0x310 kernel/exit.c:1010 __do_sys_exit_group kernel/exit.c:1021 [inline] __se_sys_exit_group kernel/exit.c:1019 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1019 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888112776000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff888112776000, ffff888112776200) The buggy address belongs to the page: page:ffffea000449dd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112774 head:ffffea000449dd00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea00043ff700 0000000500000005 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 111, ts 4661229123, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 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] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] alloc_skb_with_frags+0xa8/0x620 net/core/skbuff.c:6220 sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2541 unix_dgram_sendmsg+0x6f3/0x19b0 net/unix/af_unix.c:1816 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1080 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 page_owner free stack trace missing Memory state around the buggy address: ffff888112775f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888112775f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888112776000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888112776080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888112776100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb 4-1: new high-speed USB device number 9 using dummy_hcd usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? savu 0003:1E7D:2D5A.0024: hidraw0: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.3-1/input0 usb 3-1: USB disconnect, device number 9 usb 3-1: new high-speed USB device number 10 using dummy_hcd usb 3-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 3-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 3-1: config 0 descriptor?? savu 0003:1E7D:2D5A.002A: hidraw1: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.2-1/input0 usb 3-1: USB disconnect, device number 10 usb 3-1: new high-speed USB device number 11 using dummy_hcd usb 3-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 3-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 3-1: config 0 descriptor?? savu 0003:1E7D:2D5A.0031: hidraw3: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.2-1/input0 usb 4-1: USB disconnect, device number 11 usb 4-1: new high-speed USB device number 12 using dummy_hcd usb 4-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 4-1: New USB device found, idVendor=1e7d, idProduct=2d5a, bcdDevice= 0.00 usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 4-1: config 0 descriptor?? savu 0003:1E7D:2D5A.0034: hidraw1: USB HID v0.00 Device [HID 1e7d:2d5a] on usb-dummy_hcd.3-1/input0