==================================================================
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 ffff888055ffb8e8 by task syz-executor/9063
CPU: 3 UID: 0 PID: 9063 Comm: syz-executor 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
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:finish_task_switch.isra.0+0x2ca/0x10d0 kernel/sched/core.c:5371
Code: b6 0a 00 00 41 c7 87 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 8d 7f 48 e8 f3 ea fa 09 e8 7e 06 3d 00 fb 48 8d bb 10 17 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc900037ef3d0 EFLAGS: 00000202
RAX: 0000000000000149 RBX: ffff888034804b00 RCX: 0000000000000080
RDX: 0000000000000001 RSI: ffffffff8e3eaa9f RDI: ffff888034806210
RBP: ffffc900037ef428 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81d71c79 R12: ffff88805a9d8000
R13: 0000000000000000 R14: ffffffff91452704 R15: ffff88806a73bf00
context_switch kernel/sched/core.c:5523 [inline]
__schedule+0x1261/0x6920 kernel/sched/core.c:7270
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5913
Code: 05 4f b1 a4 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 5e e6 5d 0f 0f 82 c9 02 00 00 8b 35 fe 17 5e 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 ed b0 a4 12 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc900037ef6a0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000000 RSI: ffffffff8e3c46d0 RDI: ffffffff8c620c80
RBP: ffffffff8edec060 R08: 00000000a2445889 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire.constprop.0+0x23/0x30 include/linux/rcupdate.h:309
rcu_read_lock include/linux/rcupdate.h:849 [inline]
percpu_ref_tryget_many include/linux/percpu-refcount.h:241 [inline]
percpu_ref_tryget include/linux/percpu-refcount.h:266 [inline]
css_tryget include/linux/cgroup_refcnt.h:45 [inline]
css_tryget include/linux/cgroup_refcnt.h:42 [inline]
get_mem_cgroup_from_objcg+0xd7/0x1f0 include/linux/memcontrol.h:496
__memcg_slab_post_alloc_hook+0x26a/0x1270 mm/memcontrol.c:3631
memcg_slab_post_alloc_hook mm/slub.c:2517 [inline]
slab_post_alloc_hook mm/slub.c:4702 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_lru_noprof+0x4f6/0x6a0 mm/slub.c:5029
proc_alloc_inode+0x25/0x200 fs/proc/inode.c:57
alloc_inode+0x68/0x250 fs/inode.c:338
new_inode+0x22/0x1c0 fs/inode.c:1171
proc_pid_make_inode+0x22/0x160 fs/proc/base.c:1932
proc_pid_make_base_inode.constprop.0+0x25/0x180 fs/proc/base.c:1983
proc_pid_instantiate+0x51/0x1e0 fs/proc/base.c:3459
proc_pid_lookup+0x1f3/0x4e0 fs/proc/base.c:3502
proc_root_lookup+0x23/0x70 fs/proc/root.c:417
__lookup_slow+0x155/0x320 fs/namei.c:1919
lookup_slow+0x50/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0x1712/0x1cc0 fs/namei.c:2653
path_openat+0x1ac/0x2440 fs/namei.c:4996
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
RIP: 0033:0x7f98ee95e98e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffc95ecb0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055559429e500 RCX: 00007f98ee95e98e
RDX: 0000000000080001 RSI: 00007f98eea35fb9 RDI: ffffffffffffff9c
RBP: 00007f98eea35fb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007ffc95ecb190 R14: 000000000001b90d R15: 00007ffc95ecb700
Allocated by task 8892:
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]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_noprof+0x32f/0x840 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
usb_copy_descriptors+0xcd/0x320 drivers/usb/gadget/config.c:82
f_midi2_bind+0x1dad/0x2770 drivers/usb/gadget/function/f_midi2.c:2026
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:1662
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
__driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292
bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
driver_register+0x1e2/0x360 drivers/base/driver.c:174
usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752
gadget_dev_desc_UDC_store+0x1b0/0x2e0 drivers/usb/gadget/configfs.c:300
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
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 9004:
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:2748 [inline]
slab_free mm/slub.c:6499 [inline]
kfree+0x22b/0x6d0 mm/slub.c:6792
usb_free_descriptors include/linux/usb/gadget.h:903 [inline]
usb_free_all_descriptors+0x81/0x1a0 drivers/usb/gadget/config.c:151
purge_configs_funcs+0x285/0x510 drivers/usb/gadget/configfs.c:1600
configfs_composite_unbind+0xae/0x210 drivers/usb/gadget/configfs.c:1846
gadget_unbind_driver+0x20c/0x4f0 drivers/usb/gadget/udc/core.c:1724
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
driver_detach+0xd8/0x1b0 drivers/base/dd.c:1435
bus_remove_driver+0x13b/0x2e0 drivers/base/bus.c:832
driver_unregister+0x76/0xb0 drivers/base/driver.c:202
usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784
unregister_gadget drivers/usb/gadget/configfs.c:263 [inline]
gadget_dev_desc_UDC_store+0x170/0x2e0 drivers/usb/gadget/configfs.c:290
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6af/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
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 ffff888055ffb800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 232 bytes inside of
freed 512-byte region [ffff888055ffb800, ffff888055ffba00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888055ffa800 pfn:0x55ff8
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 ffff88801c042c80 ffffea000162d010 ffff88801c0407c8
raw: ffff888055ffa800 0000000000100003 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801c042c80 ffffea000162d010 ffff88801c0407c8
head: ffff888055ffa800 0000000000100003 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 8892, tgid 8891 (syz.0.736), ts 110018964443
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:3347 [inline]
allocate_slab mm/slub.c:3462 [inline]
new_slab+0xa9/0x6e0 mm/slub.c:3513
refill_objects+0xe3/0x410 mm/slub.c:7410
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__kmalloc_cache_noprof+0x4f4/0x6d0 mm/slub.c:5559
_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+0x444/0x6e0 sound/core/oss/mixer_oss.c:973
snd_mixer_oss_build_input+0x139/0xd50 sound/core/oss/mixer_oss.c:1017
snd_mixer_oss_build sound/core/oss/mixer_oss.c:1276 [inline]
snd_mixer_oss_notify_handler+0x48d/0x990 sound/core/oss/mixer_oss.c:1344
snd_card_register+0x2af/0x760 sound/core/init.c:935
f_midi2_create_card drivers/usb/gadget/function/f_midi2.c:1616 [inline]
f_midi2_bind+0x1198/0x2770 drivers/usb/gadget/function/f_midi2.c:1948
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:1662
page last free pid 30 tgid 30 ts 109616387994 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
kasan_depopulate_vmalloc_pte+0x5d/0x80 mm/kasan/shadow.c:484
apply_to_pte_range mm/memory.c:3470 [inline]
apply_to_pmd_range mm/memory.c:3514 [inline]
apply_to_pud_range mm/memory.c:3550 [inline]
apply_to_p4d_range mm/memory.c:3586 [inline]
__apply_to_page_range+0xb1d/0x1520 mm/memory.c:3622
__kasan_release_vmalloc+0xd7/0xe0 mm/kasan/shadow.c:602
kasan_release_vmalloc include/linux/kasan.h:593 [inline]
kasan_release_vmalloc_node mm/vmalloc.c:2306 [inline]
purge_vmap_node+0x210/0xb40 mm/vmalloc.c:2328
__purge_vmap_area_lazy+0x90a/0xc00 mm/vmalloc.c:2418
drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2452
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
Memory state around the buggy address:
ffff888055ffb780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888055ffb800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888055ffb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888055ffb900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888055ffb980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: b6 0a mov $0xa,%dh
2: 00 00 add %al,(%rax)
4: 41 c7 87 20 0e 00 00 movl $0x0,0xe20(%r15)
b: 00 00 00 00
f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
14: 49 8d 7f 48 lea 0x48(%r15),%rdi
18: e8 f3 ea fa 09 call 0x9faeb10
1d: e8 7e 06 3d 00 call 0x3d06a0
22: fb sti
23: 48 8d bb 10 17 00 00 lea 0x1710(%rbx),%rdi
* 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
31: fc ff df
34: 48 89 fa mov %rdi,%rdx
37: 48 c1 ea 03 shr $0x3,%rdx
3b: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
3f: 84 .byte 0x84