==================================================================
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 ffff8880554ff0e8 by task syz.0.2791/20416
CPU: 3 UID: 0 PID: 20416 Comm: syz.0.2791 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+0x500/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:1890
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113
handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
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:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 76 07 2a f6 48 89 df e8 fe 56 2a f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 d5 66 19 f6 65 8b 05 4e 77 a8 08 85 c0 74 16 5b
RSP: 0000:ffffc9000052f9d0 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff888021b8c000 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffffff8e1a87b4 RDI: ffffffff8c400a80
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 00000000c0000000
R13: ffff88807ac8ec78 R14: 0000000000000000 R15: ffff88807ac8ec00
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
dummy_urb_enqueue+0x56c/0x880 drivers/usb/gadget/udc/dummy_hcd.c:1337
usb_hcd_submit_urb+0x268/0x2150 drivers/usb/core/hcd.c:1542
usb_submit_urb+0x827/0x19b0 drivers/usb/core/urb.c:586
usbtmc_write+0x7b1/0xcc0 drivers/usb/class/usbtmc.c:1625
do_loop_readv_writev fs/read_write.c:851 [inline]
do_loop_readv_writev fs/read_write.c:836 [inline]
vfs_writev+0x5ed/0xdd0 fs/read_write.c:1060
do_writev+0x13e/0x340 fs/read_write.c:1104
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70cefec
Code: Unable to access opcode bytes at 0xf70cefc2.
RSP: 002b:00000000f54bd50c EFLAGS: 00000292 ORIG_RAX: 0000000000000092
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00000000800006c0
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 20211:
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+0x2e5/0x6c0 mm/slub.c:5489
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
rxrpc_alloc_peer+0xa7/0x400 net/rxrpc/peer_object.c:229
rxrpc_service_prealloc_one+0xc5e/0x1040 net/rxrpc/call_accept.c:73
rxrpc_kernel_charge_accept+0xdd/0x120 net/rxrpc/call_accept.c:489
afs_charge_preallocation+0xd8/0x360 fs/afs/rxrpc.c:766
afs_open_socket+0x31e/0x3f0 fs/afs/rxrpc.c:112
afs_net_init+0x825/0xb00 fs/afs/main.c:116
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x118/0x3a0 net/core/net_namespace.c:446
copy_net_ns+0x46f/0x7c0 net/core/net_namespace.c:579
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
copy_namespaces+0x468/0x5e0 kernel/nsproxy.c:195
copy_process+0x385f/0x8030 kernel/fork.c:2292
kernel_clone+0x176/0x9d0 kernel/fork.c:2748
__do_compat_sys_ia32_clone+0xd4/0x120 arch/x86/kernel/sys_ia32.c:255
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 6539:
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:2677 [inline]
slab_free mm/slub.c:6377 [inline]
kfree+0x22b/0x6c0 mm/slub.c:6692
rxrpc_discard_prealloc+0x1ef/0x9c0 net/rxrpc/call_accept.c:200
rxrpc_listen+0x26c/0x330 net/rxrpc/af_rxrpc.c:247
afs_close_socket+0xb0/0x410 fs/afs/rxrpc.c:134
afs_net_exit+0x93/0x150 fs/afs/main.c:149
ops_exit_list net/core/net_namespace.c:199 [inline]
ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252
cleanup_net+0x499/0x920 net/core/net_namespace.c:702
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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 ffff8880554ff000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 232 bytes inside of
freed 512-byte region [ffff8880554ff000, ffff8880554ff200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880554fc000 pfn:0x554fc
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 ffff88801bc42c80 ffffea000182bd10 ffffea0001804b10
raw: ffff8880554fc000 0000000800100004 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801bc42c80 ffffea000182bd10 ffffea0001804b10
head: ffff8880554fc000 0000000800100004 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 17967, tgid 17966 (syz.2.2312), ts 793813820629, free_ts 788984114476
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3266 [inline]
allocate_slab mm/slub.c:3380 [inline]
new_slab+0xa2/0x640 mm/slub.c:3426
refill_objects+0xe3/0x410 mm/slub.c:7310
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675
alloc_from_pcs mm/slub.c:4773 [inline]
slab_alloc_node mm/slub.c:4905 [inline]
__kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485
_kmalloc_noprof include/linux/slab.h:988 [inline]
snd_mixer_oss_build_test+0x7a/0x380 sound/core/oss/mixer_oss.c:896
snd_mixer_oss_build_test_all+0x230/0x6e0 sound/core/oss/mixer_oss.c:956
snd_mixer_oss_build_input+0x139/0xd50 sound/core/oss/mixer_oss.c:1020
snd_mixer_oss_build sound/core/oss/mixer_oss.c:1279 [inline]
snd_mixer_oss_notify_handler+0x48d/0x990 sound/core/oss/mixer_oss.c:1347
snd_card_register+0x2af/0x760 sound/core/init.c:931
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 5153 tgid 5153 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
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:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4584 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4931
locks_alloc_lock fs/locks.c:285 [inline]
flock_lock_inode+0xccd/0x11a0 fs/locks.c:1150
flock_lock_inode_wait fs/locks.c:2229 [inline]
locks_lock_inode_wait+0x119/0x490 fs/locks.c:2256
locks_lock_file_wait include/linux/filelock.h:461 [inline]
__do_sys_flock+0x462/0x4d0 fs/locks.c:2324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff8880554fef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880554ff000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880554ff080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880554ff100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880554ff180: 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 07 2a f6 call 0xf62a0789
13: 48 89 df mov %rbx,%rdi
16: e8 fe 56 2a f6 call 0xf62a5719
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 d5 66 19 f6 call 0xf6196709
34: 65 8b 05 4e 77 a8 08 mov %gs:0x8a8774e(%rip),%eax # 0x8a87789
3b: 85 c0 test %eax,%eax
3d: 74 16 je 0x55
3f: 5b pop %rbx