==================================================================
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 ffff888061d9f8da by task kworker/0:5/16820
CPU: 0 UID: 0 PID: 16820 Comm: kworker/0:5 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:
__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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:221
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 76 79 f8 f5 48 89 df e8 fe cf f8 f5 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 25 96 e7 f5 65 48 83 3d f4 10 ca 09 00 74 16 5b
RSP: 0000:ffffc9000377eda8 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff888025d20000 RCX: 0000000000000040
RDX: 0000000000000001 RSI: ffffffff8e626a08 RDI: ffffffff8c836280
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000040000000
R13: ffff8880262b3480 R14: 0000000000000000 R15: ffff8880262b3400
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
dummy_urb_enqueue+0x56c/0x8b0 drivers/usb/gadget/udc/dummy_hcd.c:1369
usb_hcd_submit_urb+0x268/0x2140 drivers/usb/core/hcd.c:1542
usb_submit_urb+0x827/0x19b0 drivers/usb/core/urb.c:594
imon_init_intf0 drivers/media/rc/imon.c:2277 [inline]
imon_probe+0x911/0x2f30 drivers/media/rc/imon.c:2438
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
Allocated by task 10689:
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]
snd_mixer_oss_build_test+0x7a/0x380 sound/core/oss/mixer_oss.c:893
snd_mixer_oss_build_test_all+0x5d0/0x6e0 sound/core/oss/mixer_oss.c:988
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
try_to_register_card+0x1d6/0x390 sound/usb/card.c:880
usb_audio_probe+0xf7d/0x3550 sound/usb/card.c:1083
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
Freed by task 10689:
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
__free_kfree include/linux/slab.h:599 [inline]
snd_mixer_oss_build_test+0x118/0x380 sound/core/oss/mixer_oss.c:892
snd_mixer_oss_build_test_all+0x5d0/0x6e0 sound/core/oss/mixer_oss.c:988
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
try_to_register_card+0x1d6/0x390 sound/usb/card.c:880
usb_audio_probe+0xf7d/0x3550 sound/usb/card.c:1083
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
The buggy address belongs to the object at ffff888061d9f800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 218 bytes inside of
freed 512-byte region [ffff888061d9f800, ffff888061d9fa00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888061d9d000 pfn:0x61d9c
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 ffffea0001357f10 ffffea0001c9cf10
raw: ffff888061d9d000 0000000000100003 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801d442c80 ffffea0001357f10 ffffea0001c9cf10
head: ffff888061d9d000 0000000000100003 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 5792, tgid 5792 (syz-executor), ts 49054926743
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]
__do_kmalloc_node mm/slub.c:5530 [inline]
__kmalloc_noprof+0x677/0x840 mm/slub.c:5556
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:189
ip6_route_info_create+0x14c/0xad0 net/ipv6/route.c:3827
addrconf_f6i_alloc+0x2d9/0x670 net/ipv6/route.c:4714
fixup_permanent_addr net/ipv6/addrconf.c:3630 [inline]
addrconf_permanent_addr net/ipv6/addrconf.c:3681 [inline]
addrconf_notify+0x13c6/0x1ba0 net/ipv6/addrconf.c:3748
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
netif_change_flags+0x108/0x160 net/core/dev.c:10080
do_setlink.isra.0+0x1b9f/0x3f50 net/core/rtnetlink.c:3294
page last free pid 5791 tgid 5791 ts 48060287670 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]
kmem_cache_alloc_lru_noprof+0x265/0x6a0 mm/slub.c:5066
sock_alloc_inode+0x26/0x2c0 net/socket.c:330
alloc_inode+0x68/0x250 fs/inode.c:338
new_inode_pseudo include/linux/fs.h:3053 [inline]
sock_alloc+0x42/0x240 net/socket.c:710
__sock_create+0xc2/0x860 net/socket.c:1643
sock_create net/socket.c:1737 [inline]
__sys_socket_create net/socket.c:1774 [inline]
__sys_socket+0x14d/0x260 net/socket.c:1821
__do_compat_sys_socketcall net/compat.c:447 [inline]
__se_compat_sys_socketcall net/compat.c:422 [inline]
__ia32_compat_sys_socketcall+0x65b/0x770 net/compat.c:422
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
__do_fast_syscall_32+0x14d/0x8e0 arch/x86/entry/syscall_32.c:286
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:311
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Memory state around the buggy address:
ffff888061d9f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888061d9f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888061d9f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888061d9f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888061d9f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f5 cmc
1: 53 push %rbx
2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
7: 48 89 fb mov %rdi,%rbx
a: 48 83 c7 18 add $0x18,%rdi
e: e8 76 79 f8 f5 call 0xf5f87989
13: 48 89 df mov %rbx,%rdi
16: e8 fe cf f8 f5 call 0xf5f8d019
1b: f7 c5 00 02 00 00 test $0x200,%ebp
21: 75 23 jne 0x46
23: 9c pushf
24: 58 pop %rax
25: f6 c4 02 test $0x2,%ah
28: 75 37 jne 0x61
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 25 96 e7 f5 call 0xf5e79659
34: 65 48 83 3d f4 10 ca cmpq $0x0,%gs:0x9ca10f4(%rip) # 0x9ca1131
3b: 09 00
3d: 74 16 je 0x55
3f: 5b pop %rbx