==================================================================
BUG: KASAN: slab-use-after-free in find_endpoint+0x2a3/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1618
Read of size 1 at addr ffff8880548bd512 by task kworker/0:1/21308
CPU: 0 UID: 0 PID: 21308 Comm: kworker/0:1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1618
dummy_timer+0x500/0x3700 drivers/usb/gadget/udc/dummy_hcd.c:1890
__run_hrtimer kernel/time/hrtimer.c:2067 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124
hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x194/0x210 kernel/softirq.c:767
irq_exit_rcu+0x9/0x30 kernel/softirq.c:784
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:__sanitizer_cov_trace_pc+0x4b/0x70 kernel/kcov.c:220
Code: 1e f6 c4 01 74 44 a9 00 00 00 0f 75 3d f7 c1 00 00 00 f0 75 35 8b 82 34 17 00 00 85 c0 74 2b 8b 82 08 17 00 00 83 f8 02 75 20 <48> 8b 8a 10 17 00 00 8b 92 0c 17 00 00 48 8b 01 48 83 c0 01 48 39
RSP: 0018:ffffc900048d6e28 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff88801dfd8f80 RCX: 0000000000000001
RDX: ffff888028150000 RSI: ffffffff86625400 RDI: ffff88801dfd8f98
RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff5200091adb8
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88801c1f8000
R13: ffff88801c1f82b0 R14: ffff888035992078 R15: ffff88801c1f82c0
get_device_parent+0x150/0x4c0 drivers/base/core.c:3342
device_add+0x1ad/0x1970 drivers/base/core.c:3685
input_register_device+0x7d2/0xe00 drivers/input/input.c:2436
xpad_init_input+0xee3/0x14b0 drivers/input/joystick/xpad.c:2028
xpad_probe+0x152a/0x1f60 drivers/input/joystick/xpad.c:2206
usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x210/0x460 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3776
usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x210/0x460 drivers/base/dd.c:868
driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
__device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153
bus_probe_device+0x64/0x160 drivers/base/bus.c:620
device_add+0x121d/0x1970 drivers/base/core.c:3776
usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2703
usb_new_device include/linux/workqueue.h:714 [inline]
hub_port_connect drivers/usb/core/hub.c:5575 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5715 [inline]
port_event drivers/usb/core/hub.c:5879 [inline]
hub_event.cold+0x1e3/0xe90 drivers/usb/core/hub.c:5961
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387
process_scheduled_works kernel/workqueue.c:3470 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551
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 21588:
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:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x2e7/0x6b0 mm/slub.c:5484
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
kernfs_fop_open+0x23d/0xd50 fs/kernfs/file.c:634
do_dentry_open+0x6ab/0x14d0 fs/open.c:996
vfs_open+0x82/0x3f0 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x19fa/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1434
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 21588:
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:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2678 [inline]
slab_free mm/slub.c:6372 [inline]
kfree+0x22b/0x6c0 mm/slub.c:6687
kernfs_fop_release+0x12c/0x1f0 fs/kernfs/file.c:779
__fput+0x3ff/0xb50 fs/file_table.c:512
fput_close_sync+0x118/0x250 fs/file_table.c:617
__do_sys_close fs/open.c:1560 [inline]
__se_sys_close fs/open.c:1545 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1545
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 ffff8880548bd400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 274 bytes inside of
freed 512-byte region [ffff8880548bd400, ffff8880548bd600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880548bd000 pfn:0x548bc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801c026c80 ffffea0001f00a10 ffffea0001530d10
raw: ffff8880548bd000 000000080010000f 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801c026c80 ffffea0001f00a10 ffffea0001530d10
head: ffff8880548bd000 000000080010000f 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 37, tgid 37 (kworker/u8:2), ts 74206164343
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3267 [inline]
allocate_slab mm/slub.c:3382 [inline]
new_slab+0xa5/0x640 mm/slub.c:3428
refill_objects+0xe3/0x410 mm/slub.c:7305
refill_sheaf mm/slub.c:2805 [inline]
__pcs_replace_empty_main+0x372/0x680 mm/slub.c:4677
alloc_from_pcs mm/slub.c:4775 [inline]
slab_alloc_node mm/slub.c:4907 [inline]
__kmalloc_cache_noprof+0x47b/0x6b0 mm/slub.c:5480
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
mca_alloc net/ipv6/mcast.c:871 [inline]
__ipv6_dev_mc_inc+0x2f1/0xbd0 net/ipv6/mcast.c:962
addrconf_join_solict net/ipv6/addrconf.c:2262 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4135 [inline]
addrconf_dad_work+0x276/0x1360 net/ipv6/addrconf.c:4263
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387
process_scheduled_works kernel/workqueue.c:3470 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551
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
page last free pid 1 tgid 1 ts 21599293121 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
free_pages_prepare+0x586/0xe00 mm/page_alloc.c:1463
__free_contig_range_common+0x14f/0x250 mm/page_alloc.c:7060
debug_vm_pgtable_free_huge_page mm/debug_vm_pgtable.c:980 [inline]
destroy_args+0xa8/0x7a0 mm/debug_vm_pgtable.c:993
debug_vm_pgtable+0x1d69/0x3490 mm/debug_vm_pgtable.c:1368
do_one_initcall+0x11c/0x6f0 init/main.c:1353
do_initcall_level init/main.c:1415 [inline]
do_initcalls init/main.c:1431 [inline]
do_basic_setup init/main.c:1451 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1666
kernel_init+0x21/0x1e0 init/main.c:1556
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880548bd400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880548bd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880548bd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880548bd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880548bd600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: f6 c4 01 test $0x1,%ah
3: 74 44 je 0x49
5: a9 00 00 00 0f test $0xf000000,%eax
a: 75 3d jne 0x49
c: f7 c1 00 00 00 f0 test $0xf0000000,%ecx
12: 75 35 jne 0x49
14: 8b 82 34 17 00 00 mov 0x1734(%rdx),%eax
1a: 85 c0 test %eax,%eax
1c: 74 2b je 0x49
1e: 8b 82 08 17 00 00 mov 0x1708(%rdx),%eax
24: 83 f8 02 cmp $0x2,%eax
27: 75 20 jne 0x49
* 29: 48 8b 8a 10 17 00 00 mov 0x1710(%rdx),%rcx <-- trapping instruction
30: 8b 92 0c 17 00 00 mov 0x170c(%rdx),%edx
36: 48 8b 01 mov (%rcx),%rax
39: 48 83 c0 01 add $0x1,%rax
3d: 48 rex.W
3e: 39 .byte 0x39