==================================================================
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 ffff88806172c4e8 by task kworker/3:1/42

CPU: 3 UID: 0 PID: 42 Comm: kworker/3:1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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:2079 [inline]
 __hrtimer_run_queues+0x448/0x9a0 kernel/time/hrtimer.c:2136
 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2153
 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:lock_is_held_type+0xf5/0x140 kernel/locking/lockdep.c:6021
Code: ff ff ff ff 65 0f c1 15 f1 67 cd 09 83 fa 01 8b 44 24 04 75 2d 9c 5a 80 e6 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 83 c4 08 <5b> 5d 41 5c 41 5d 41 5e 41 5f e9 8c 58 03 00 e9 87 58 03 00 31 c0
RSP: 0018:ffffc90000656838 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffffffff8ffeada0 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8e5ff9b7 RDI: ffffffff8c836280
RBP: ffff88801ef08000 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88801eacf1af R11: 0000000000000001 R12: 00000000ffffffff
R13: 0000000000000246 R14: ffff88801ef08cc8 R15: 0000000000000007
 lock_is_held include/linux/lockdep.h:249 [inline]
 __might_resched+0x298/0x330 kernel/sched/core.c:9164
 down_write+0x6a/0x1f0 kernel/locking/rwsem.c:1630
 kernfs_add_one+0x4cb/0xb40 fs/kernfs/dir.c:857
 kernfs_create_dir_ns+0x155/0x2b0 fs/kernfs/dir.c:1143
 sysfs_create_dir_ns+0x13a/0x2b0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x2c8/0x930 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x16a/0x1e0 lib/kobject.c:426
 device_add+0x294/0x1970 drivers/base/core.c:3701
 device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4460
 device_create+0xed/0x130 drivers/base/core.c:4499
 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:500
 __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:614
 device_add+0x121d/0x1970 drivers/base/core.c:3778
 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:500
 __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:614
 device_add+0x121d/0x1970 drivers/base/core.c:3778
 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 6286:
 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]
 kernfs_fop_open+0x347/0x10f0 fs/kernfs/file.c:648
 do_dentry_open+0x674/0x1470 fs/open.c:1000
 vfs_open_consume+0xcc/0x460 fs/open.c:1131
 do_open fs/namei.c:4851 [inline]
 path_openat+0x1547/0x23f0 fs/namei.c:5016
 do_file_open+0x20e/0x430 fs/namei.c:5045
 do_sys_openat2+0x163/0x1d0 fs/open.c:1443
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_openat fs/open.c:1465 [inline]
 __se_sys_openat fs/open.c:1460 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1460
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x780 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6286:
 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
 kernfs_fop_release+0x12c/0x1f0 fs/kernfs/file.c:793
 __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:1574
 __do_sys_close fs/open.c:1597 [inline]
 __se_sys_close fs/open.c:1584 [inline]
 __x64_sys_close+0x81/0x110 fs/open.c:1584
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x780 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88806172c400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 232 bytes inside of
 freed 512-byte region [ffff88806172c400, ffff88806172c600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88806172c800 pfn:0x6172c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000240(workingset|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000240 ffff88801d442c80 ffffea000132e410 ffffea0001854010
raw: ffff88806172c800 0000000000100001 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801d442c80 ffffea000132e410 ffffea0001854010
head: ffff88806172c800 0000000000100001 00000000f5000000 0000000000000000
head: 04fff00000000002 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 6040, tgid 6039 (syz.0.22), ts 48588103377
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x112f/0x3640 mm/page_alloc.c:3940
 __alloc_frozen_pages_noprof+0x2ad/0x31e0 mm/page_alloc.c:5464
 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]
 snd_mixer_oss_build_test+0x7a/0x380 sound/core/oss/mixer_oss.c:893
 snd_mixer_oss_build_test_all+0x1ac/0x6e0 sound/core/oss/mixer_oss.c:948
 snd_mixer_oss_build_input+0x139/0xd50 sound/core/oss/mixer_oss.c:1017
 snd_mixer_oss_build sound/core/oss/mixer_oss.c:1277 [inline]
 snd_mixer_oss_notify_handler+0x4e5/0xa10 sound/core/oss/mixer_oss.c:1355
 snd_mixer_oss_notify sound/core/init.c:92 [inline]
 snd_card_register+0x2bd/0x780 sound/core/init.c:929
 f_midi2_create_card drivers/usb/gadget/function/f_midi2.c:1615 [inline]
 f_midi2_bind+0x1198/0x2770 drivers/usb/gadget/function/f_midi2.c:1947
 usb_add_function+0x219/0x890 drivers/usb/gadget/composite.c:333
 configfs_composite_bind+0xd83/0x1960 drivers/usb/gadget/configfs.c:1802
 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1663
page last free pid 5797 tgid 5797 ts 39999033766 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1403 [inline]
 __free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2957
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 __kmalloc_cache_noprof+0x278/0x6d0 mm/slub.c:5676
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 ipv6_add_addr+0x531/0x20e0 net/ipv6/addrconf.c:1129
 addrconf_add_linklocal+0x2ae/0x510 net/ipv6/addrconf.c:3353
 addrconf_addr_gen+0x338/0x3b0 net/ipv6/addrconf.c:3477
 addrconf_dev_config net/ipv6/addrconf.c:3536 [inline]
 addrconf_init_auto_addrs+0x1cb/0x780 net/ipv6/addrconf.c:3614
 addrconf_notify+0x10af/0x1ba0 net/ipv6/addrconf.c:3794
 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:86
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2313
 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline]
 call_netdevice_notifiers net/core/dev.c:2365 [inline]
 __dev_notify_flags+0x22c/0x4b0 net/core/dev.c:10051
 rtnl_configure_link+0x21b/0x4c0 net/core/rtnetlink.c:3769
 rtnl_newlink_create net/core/rtnetlink.c:4014 [inline]
 __rtnl_newlink net/core/rtnetlink.c:4135 [inline]
 rtnl_newlink+0x16d1/0x2620 net/core/rtnetlink.c:4252
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7169

Memory state around the buggy address:
 ffff88806172c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806172c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806172c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88806172c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806172c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	ff 65 0f             	jmp    *0xf(%rbp)
   3:	c1 15 f1 67 cd 09 83 	rcll   $0x83,0x9cd67f1(%rip)        # 0x9cd67fb
   a:	fa                   	cli
   b:	01 8b 44 24 04 75    	add    %ecx,0x75042444(%rbx)
  11:	2d 9c 5a 80 e6       	sub    $0xe6805a9c,%eax
  16:	02 75 47             	add    0x47(%rbp),%dh
  19:	41 f7 c5 00 02 00 00 	test   $0x200,%r13d
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	48 83 c4 08          	add    $0x8,%rsp
* 27:	5b                   	pop    %rbx <-- trapping instruction
  28:	5d                   	pop    %rbp
  29:	41 5c                	pop    %r12
  2b:	41 5d                	pop    %r13
  2d:	41 5e                	pop    %r14
  2f:	41 5f                	pop    %r15
  31:	e9 8c 58 03 00       	jmp    0x358c2
  36:	e9 87 58 03 00       	jmp    0x358c2
  3b:	31 c0                	xor    %eax,%eax