==================================================================
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 ffff8880446f6cda by task kswapd1/115
CPU: 3 UID: 0 PID: 115 Comm: kswapd1 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: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:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 0f 9d d1 13 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 1e 1c 82 10 0f 82 c9 02 00 00 8b 35 fe 4b 82 10 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 ad 9c d1 13 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc900021d6c80 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000002 RSI: ffffffff8e5ffa1c RDI: ffffffff8c836280
RBP: ffffffff8ffeada0 R08: 0000000017d150a0 R09: 000000000000001e
R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:947 [inline]
pfn_valid+0xd8/0x4b0 include/linux/mmzone.h:2297
get_pte_pfn+0x29a/0x3d0 mm/vmscan.c:3597
lru_gen_look_around+0x97d/0x1240 mm/vmscan.c:4502
folio_referenced_one+0x10bd/0x17d0 mm/rmap.c:989
__rmap_walk_file+0x377/0x6b0 mm/rmap.c:3121
rmap_walk_file+0x1d8/0x2a0 mm/rmap.c:3154
rmap_walk mm/rmap.c:3165 [inline]
folio_referenced+0x496/0x6f0 mm/rmap.c:1115
folio_check_references mm/vmscan.c:977 [inline]
shrink_folio_list+0x25cb/0x59c0 mm/vmscan.c:1335
evict_folios+0x35b/0x1790 mm/vmscan.c:5097
try_to_shrink_lruvec+0x32e/0x7b0 mm/vmscan.c:5271
shrink_one+0x342/0x870 mm/vmscan.c:5318
shrink_many mm/vmscan.c:5381 [inline]
lru_gen_shrink_node mm/vmscan.c:5459 [inline]
shrink_node+0x2a61/0x4410 mm/vmscan.c:6465
kswapd_shrink_node mm/vmscan.c:7258 [inline]
balance_pgdat+0xa9e/0x1e60 mm/vmscan.c:7429
kswapd+0x556/0xb50 mm/vmscan.c:7705
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 8361:
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]
tipc_sub_subscribe+0x15c/0x730 net/tipc/subscr.c:146
tipc_conn_rcv_sub+0x21e/0x3d0 net/tipc/topsrv.c:404
tipc_conn_rcv_from_sock+0x2a4/0x320 net/tipc/topsrv.c:434
tipc_conn_recv_work+0x196/0x200 net/tipc/topsrv.c:459
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 14:
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
tipc_sub_kref_release net/tipc/subscr.c:118 [inline]
kref_put include/linux/kref.h:65 [inline]
tipc_sub_put net/tipc/subscr.c:123 [inline]
tipc_sub_unsubscribe+0x1d5/0x260 net/tipc/subscr.c:182
tipc_conn_delete_sub+0x14c/0x290 net/tipc/topsrv.c:244
tipc_conn_send_to_sock+0x3ae/0x5a0 net/tipc/topsrv.c:272
tipc_conn_send_work+0x14b/0x1b0 net/tipc/topsrv.c:319
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 ffff8880446f6c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 218 bytes inside of
freed 512-byte region [ffff8880446f6c00, ffff8880446f6e00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880446f5000 pfn:0x446f4
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 ffffea00016d7110 ffffea000139a410
raw: ffff8880446f5000 000000000010000e 00000000f5000000 0000000000000000
head: 04fff00000000240 ffff88801d442c80 ffffea00016d7110 ffffea000139a410
head: ffff8880446f5000 000000000010000e 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1163, tgid 1163 (kworker/u33:8), ts 40639973459
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
ip6_route_add+0x4b/0x1d0 net/ipv6/route.c:3956
addrconf_prefix_route+0x2fb/0x510 net/ipv6/addrconf.c:2522
addrconf_add_linklocal+0x332/0x510 net/ipv6/addrconf.c:3355
addrconf_addr_gen+0x364/0x3b0 net/ipv6/addrconf.c:3489
addrconf_dev_config net/ipv6/addrconf.c:3536 [inline]
addrconf_init_auto_addrs+0x1cb/0x780 net/ipv6/addrconf.c:3614
addrconf_notify+0xa10/0x1ba0 net/ipv6/addrconf.c:3794
notifier_call_chain+0x99/0x3f0 kernel/notifier.c:86
page last free pid 5784 tgid 5784 ts 39442753355 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]
ref_tracker_alloc+0x18b/0x600 lib/ref_tracker.c:270
__netdev_tracker_alloc include/linux/netdevice.h:4556 [inline]
netdev_hold include/linux/netdevice.h:4585 [inline]
netdev_hold include/linux/netdevice.h:4580 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1271 [inline]
net_rx_queue_update_kobjects+0x334/0x760 net/core/net-sysfs.c:1336
register_queue_kobjects net/core/net-sysfs.c:2134 [inline]
netdev_register_kobject+0x2c6/0x410 net/core/net-sysfs.c:2385
register_netdevice+0x1313/0x26b0 net/core/dev.c:11720
veth_newlink+0x2b7/0xd00 drivers/net/veth.c:1878
rtnl_newlink_create net/core/rtnetlink.c:4006 [inline]
__rtnl_newlink net/core/rtnetlink.c:4135 [inline]
rtnl_newlink+0x1697/0x2620 net/core/rtnetlink.c:4252
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7169
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2584
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x668/0x950 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x9ac/0x10c0 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:818 [inline]
__sys_sendto+0x492/0x4e0 net/socket.c:2283
Memory state around the buggy address:
ffff8880446f6b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880446f6c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880446f6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880446f6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880446f6d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 05 0f 9d d1 13 add $0x13d19d0f,%eax
5: 83 f8 07 cmp $0x7,%eax
8: 0f 87 da 00 00 00 ja 0xe8
e: 48 0f a3 05 1e 1c 82 bt %rax,0x10821c1e(%rip) # 0x10821c34
15: 10
16: 0f 82 c9 02 00 00 jb 0x2e5
1c: 8b 35 fe 4b 82 10 mov 0x10824bfe(%rip),%esi # 0x10824c20
22: 85 f6 test %esi,%esi
24: 0f 85 c7 00 00 00 jne 0xf1
* 2a: 48 8b 44 24 30 mov 0x30(%rsp),%rax <-- trapping instruction
2f: 65 48 2b 05 ad 9c d1 sub %gs:0x13d19cad(%rip),%rax # 0x13d19ce4
36: 13
37: 0f 85 09 03 00 00 jne 0x346
3d: 48 rex.W
3e: 83 .byte 0x83
3f: c4 .byte 0xc4