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:
 <TASK>
 __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
 </TASK>

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