==================================================================
BUG: KASAN: slab-use-after-free in find_endpoint+0x2a3/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1650
Read of size 1 at addr ffff88802de870e8 by task kworker/1:1/30

CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 find_endpoint+0x2a3/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1650
 dummy_timer+0x506/0x3840 drivers/usb/gadget/udc/dummy_hcd.c:1922
 __run_hrtimer kernel/time/hrtimer.c:2075 [inline]
 __hrtimer_run_queues+0x448/0x9a0 kernel/time/hrtimer.c:2132
 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2149
 handle_softirqs+0x216/0xa20 kernel/softirq.c:669
 __do_softirq kernel/softirq.c:703 [inline]
 invoke_softirq kernel/softirq.c:542 [inline]
 __irq_exit_rcu+0x178/0x220 kernel/softirq.c:786
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:class_to_subsys+0xcf/0x150 drivers/base/class.c:59
Code: 85 8e 00 00 00 48 8b 43 08 48 8d 58 f8 48 39 c5 74 6b e8 74 0a 91 fb 48 8d bb f8 02 00 00 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <75> 60 4c 39 ab f8 02 00 00 75 b5 e8 51 0a 91 fb 4c 8d 63 b0 e8 48
RSP: 0018:ffffc90000a66b88 EFLAGS: 00000246
RAX: 1ffff11004ad9669 RBX: ffff8880256cb050 RCX: ffffc9001abb5000
RDX: 0000000000100000 RSI: ffffffff867d486c RDI: ffff8880256cb348
RBP: ffff888020a91000 R08: 0000000000000001 R09: fffff5200014cd63
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff8ce99980 R14: ffff88807c148078 R15: ffff8880554df048
 get_device_parent+0x43/0x4c0 drivers/base/core.c:3317
 device_add+0x1ad/0x1970 drivers/base/core.c:3685
 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4458
 device_create+0xed/0x130 drivers/base/core.c:4497
 usb_register_dev+0x2f0/0x570 drivers/usb/core/file.c:150
 yurex_probe+0xb03/0xfb0 drivers/usb/misc/yurex.c:286
 usb_probe_interface+0x386/0x980 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:629 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:707
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:869
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:899
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1027
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:503
 __device_attach+0x1e4/0x4c0 drivers/base/dd.c:1131
 device_initial_probe+0xaf/0xf0 drivers/base/dd.c:1190
 __bus_probe_device+0x60/0x160 drivers/base/bus.c:617
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_set_configuration+0xd97/0x1dc0 drivers/usb/core/message.c:2280
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:629 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:707
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:869
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:899
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1027
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:503
 __device_attach+0x1e4/0x4c0 drivers/base/dd.c:1131
 device_initial_probe+0xaf/0xf0 drivers/base/dd.c:1190
 __bus_probe_device+0x60/0x160 drivers/base/bus.c:617
 device_add+0x121d/0x1970 drivers/base/core.c:3776
 usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2713
 usb_new_device include/linux/workqueue.h:715 [inline]
 hub_port_connect drivers/usb/core/hub.c:5585 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5725 [inline]
 port_event drivers/usb/core/hub.c:5889 [inline]
 hub_event.cold+0x1e3/0xe90 drivers/usb/core/hub.c:5971
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495
 process_scheduled_works kernel/workqueue.c:3578 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 12929:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5680
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 rfcomm_dlc_alloc+0x96/0x2b0 net/bluetooth/rfcomm/core.c:301
 rfcomm_sock_alloc.constprop.0+0x22/0x2a0 net/bluetooth/rfcomm/sock.c:289
 rfcomm_sock_create+0xf1/0x180 net/bluetooth/rfcomm/sock.c:331
 bt_sock_create+0x185/0x350 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x339/0x860 net/socket.c:1679
 sock_create net/socket.c:1737 [inline]
 __sys_socket_create net/socket.c:1774 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1821
 __do_sys_socket net/socket.c:1835 [inline]
 __se_sys_socket net/socket.c:1833 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1833
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 12937:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:264 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2780 [inline]
 slab_free mm/slub.c:6630 [inline]
 kfree+0x22b/0x6d0 mm/slub.c:6923
 rfcomm_dlc_put include/net/bluetooth/rfcomm.h:258 [inline]
 rfcomm_sock_destruct+0x12b/0x1e0 net/bluetooth/rfcomm/sock.c:182
 __sk_destruct+0x85/0xb70 net/core/sock.c:2386
 sk_destruct+0xc8/0xf0 net/core/sock.c:2448
 __sk_free+0xf4/0x3e0 net/core/sock.c:2459
 sk_free+0x61/0x90 net/core/sock.c:2470
 sock_put include/net/sock.h:2024 [inline]
 rfcomm_sock_kill net/bluetooth/rfcomm/sock.c:216 [inline]
 rfcomm_sock_kill+0x12b/0x230 net/bluetooth/rfcomm/sock.c:206
 rfcomm_sock_release+0x119/0x1a0 net/bluetooth/rfcomm/sock.c:953
 __sock_release+0xb3/0x260 net/socket.c:735
 sock_close+0x1c/0x30 net/socket.c:1529
 __fput+0x3fb/0xb50 fs/file_table.c:512
 fput_close_sync+0x118/0x250 fs/file_table.c:618
 filp_close_sync+0x75/0xa0 fs/open.c:1573
 close_files fs/file.c:572 [inline]
 put_files_struct fs/file.c:584 [inline]
 put_files_struct+0x1f7/0x390 fs/file.c:581
 switch_files_struct fs/file.c:598 [inline]
 exit_files+0x85/0xb0 fs/file.c:604
 do_exit+0x896/0x2a00 kernel/exit.c:977
 __do_sys_exit kernel/exit.c:1090 [inline]
 __se_sys_exit kernel/exit.c:1088 [inline]
 __x64_sys_exit+0x42/0x50 kernel/exit.c:1088
 x64_sys_call+0x156c/0x1570 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802de87000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 232 bytes inside of
 freed 512-byte region [ffff88802de87000, ffff88802de87200)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2de84
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813ff0cc80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ff0cc80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 1, tgid 1 (swapper/0), ts 11799136960
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856
 prep_new_page mm/page_alloc.c:1864 [inline]
 get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935
 __alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444
 alloc_slab_page mm/slub.c:3384 [inline]
 allocate_slab mm/slub.c:3499 [inline]
 new_slab+0xb1/0x6d0 mm/slub.c:3550
 refill_objects+0xe3/0x410 mm/slub.c:7539
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __kmalloc_cache_noprof+0x4ef/0x6d0 mm/slub.c:5676
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 device_private_init drivers/base/core.c:3606 [inline]
 device_add+0xd3f/0x1970 drivers/base/core.c:3657
 usb_hub_create_port_device+0x3c6/0xe60 drivers/usb/core/port.c:786
 hub_configure drivers/usb/core/hub.c:1744 [inline]
 hub_probe.cold+0x2974/0x2ed9 drivers/usb/core/hub.c:2011
 usb_probe_interface+0x386/0x980 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:629 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:707
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:869
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:899
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1027
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:503
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802de86f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802de87000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802de87080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88802de87100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802de87180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	85 8e 00 00 00 48    	test   %ecx,0x48000000(%rsi)
   6:	8b 43 08             	mov    0x8(%rbx),%eax
   9:	48 8d 58 f8          	lea    -0x8(%rax),%rbx
   d:	48 39 c5             	cmp    %rax,%rbp
  10:	74 6b                	je     0x7d
  12:	e8 74 0a 91 fb       	call   0xfb910a8b
  17:	48 8d bb f8 02 00 00 	lea    0x2f8(%rbx),%rdi
  1e:	48 89 f8             	mov    %rdi,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
* 2a:	75 60                	jne    0x8c <-- trapping instruction
  2c:	4c 39 ab f8 02 00 00 	cmp    %r13,0x2f8(%rbx)
  33:	75 b5                	jne    0xffffffea
  35:	e8 51 0a 91 fb       	call   0xfb910a8b
  3a:	4c 8d 63 b0          	lea    -0x50(%rbx),%r12
  3e:	e8                   	.byte 0xe8
  3f:	48                   	rex.W