vhci_hcd: release socket vhci_hcd: disconnect device ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933 Read of size 8 at addr ffff0000d1995250 by task kworker/u4:5/4384 CPU: 0 PID: 4384 Comm: kworker/u4:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Workqueue: usbip_event event_handler Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0x104/0x6634 kernel/locking/lockdep.c:4933 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162 unset_event drivers/usb/usbip/usbip_event.c:35 [inline] event_handler+0x290/0x454 drivers/usb/usbip/usbip_event.c:80 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Allocated by task 1: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xd8/0x180 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] __usb_create_hcd+0x6c/0x740 drivers/usb/core/hcd.c:2581 usb_create_hcd+0x3c/0x50 drivers/usb/core/hcd.c:2679 vhci_hcd_probe+0x108/0x354 drivers/usb/usbip/vhci_hcd.c:1376 platform_probe+0x148/0x1c8 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __device_attach_driver+0x28c/0x4c0 drivers/base/dd.c:962 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429 __device_attach+0x2a4/0x3d8 drivers/base/dd.c:1034 device_initial_probe+0x24/0x34 drivers/base/dd.c:1083 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0x93c/0xe4c drivers/base/core.c:3712 platform_device_add+0x3f8/0x6f4 drivers/base/platform.c:717 vhci_hcd_init+0x390/0x4b0 drivers/usb/usbip/vhci_hcd.c:1571 do_one_initcall+0x278/0x9f0 init/main.c:1309 do_initcall_level+0x158/0x214 init/main.c:1382 do_initcalls+0x58/0xac init/main.c:1398 do_basic_setup+0x8c/0xa0 init/main.c:1417 kernel_init_freeable+0x35c/0x4f0 init/main.c:1637 kernel_init+0x24/0x1d8 init/main.c:1525 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Freed by task 9856: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x21c mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 hcd_release drivers/usb/core/hcd.c:2707 [inline] kref_put include/linux/kref.h:65 [inline] usb_put_hcd+0x124/0x16c drivers/usb/core/hcd.c:2721 vhci_hcd_remove+0xd8/0x100 drivers/usb/usbip/vhci_hcd.c:1434 platform_remove+0x98/0xf0 drivers/base/platform.c:1422 device_remove drivers/base/dd.c:547 [inline] __device_release_driver drivers/base/dd.c:1279 [inline] device_release_driver_internal+0x3d4/0x6e4 drivers/base/dd.c:1305 device_driver_detach+0x48/0x58 drivers/base/dd.c:1341 unbind_store+0x2a8/0x2b4 drivers/base/bus.c:193 drv_attr_store+0x80/0xa4 drivers/base/bus.c:77 sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:140 kernfs_fop_write_iter+0x390/0x4b4 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000d1994000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4688 bytes inside of 8192-byte region [ffff0000d1994000, ffff0000d1996000) The buggy address belongs to the physical page: page:000000000ffaf86d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111990 head:000000000ffaf86d order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002c00 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d1995100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d1995180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d1995200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d1995280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d1995300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device