vhci_hcd: release socket vhci_hcd: disconnect device vhci_hcd: stop threads ================================================================== BUG: KASAN: use-after-free in vhci_shutdown_connection+0x211/0x580 drivers/usb/usbip/vhci_hcd.c:1057 Read of size 8 at addr ffff8881457c5568 by task kworker/u4:1/11 CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: usbip_event event_handler Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 vhci_shutdown_connection+0x211/0x580 drivers/usb/usbip/vhci_hcd.c:1057 event_handler+0x299/0x460 drivers/usb/usbip/usbip_event.c:79 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 1: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb3/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] __usb_create_hcd+0x5f/0x830 drivers/usb/core/hcd.c:2581 vhci_hcd_probe+0xff/0x370 drivers/usb/usbip/vhci_hcd.c:1376 platform_probe+0x137/0x1c0 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3712 platform_device_add+0x4bf/0x830 drivers/base/platform.c:717 vhci_hcd_init+0x3c7/0x4f1 drivers/usb/usbip/vhci_hcd.c:1571 do_one_initcall+0x257/0x800 init/main.c:1309 do_initcall_level+0x13d/0x1ed init/main.c:1382 do_initcalls+0x4b/0x8a init/main.c:1398 kernel_init_freeable+0x401/0x5ab init/main.c:1637 kernel_init+0x19/0x1b0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 5516: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 vhci_hcd_remove+0xe0/0x100 drivers/usb/usbip/vhci_hcd.c:1434 platform_remove+0x92/0xe0 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+0x47d/0x7c0 drivers/base/dd.c:1305 unbind_store+0x2e2/0x300 drivers/base/bus.c:193 kernfs_fop_write_iter+0x3a0/0x520 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+0x482/0x9a0 fs/read_write.c:584 ksys_write+0x14d/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8881457c4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 5480 bytes inside of 8192-byte region [ffff8881457c4000, ffff8881457c6000) The buggy address belongs to the physical page: page:ffffea000515f000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1457c0 head:ffffea000515f000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 0000000000000000 dead000000000122 ffff888017442280 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 10107823546, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] dummy_hcd_init+0x68e/0x1167 drivers/usb/gadget/udc/dummy_hcd.c:2839 do_one_initcall+0x257/0x800 init/main.c:1309 do_initcall_level+0x13d/0x1ed init/main.c:1382 do_initcalls+0x4b/0x8a init/main.c:1398 kernel_init_freeable+0x401/0x5ab init/main.c:1637 kernel_init+0x19/0x1b0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page_owner free stack trace missing Memory state around the buggy address: ffff8881457c5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881457c5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881457c5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881457c5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881457c5600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================