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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88809856e480 by task syz-executor.0/9847

CPU: 0 PID: 9847 Comm: syz-executor.0 Not tainted 5.2.0-rc3+ #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 8889:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
 kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555
 kmalloc include/linux/slab.h:547 [inline]
 kzalloc include/linux/slab.h:742 [inline]
 can_notifier+0x227/0x330 net/can/af_can.c:828
 notifier_call_chain+0xc2/0x230 kernel/notifier.c:95
 __raw_notifier_call_chain kernel/notifier.c:396 [inline]
 raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:403
 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1749
 call_netdevice_notifiers_extack net/core/dev.c:1761 [inline]
 call_netdevice_notifiers net/core/dev.c:1775 [inline]
 register_netdevice+0xa4d/0xff0 net/core/dev.c:8734
 __rtnl_newlink+0x146b/0x16c0 net/core/rtnetlink.c:3199
 rtnl_newlink+0x69/0xa0 net/core/rtnetlink.c:3245
 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:5214
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5232
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:665
 __sys_sendto+0x262/0x380 net/socket.c:1958
 __do_sys_sendto net/socket.c:1970 [inline]
 __se_sys_sendto net/socket.c:1966 [inline]
 __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1966
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888098560f80
 which belongs to the cache kmalloc-32k of size 32768
The buggy address is located 21760 bytes to the right of
 32768-byte region [ffff888098560f80, ffff888098568f80)
The buggy address belongs to the page:
page:ffffea0002615800 refcount:1 mapcount:0 mapping:ffff8880aa402380 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea0002475808 ffffea0002208408 ffff8880aa402380
raw: 0000000000000000 ffff888098560f80 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809856e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809856e400: fc fc f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 fc fc
>ffff88809856e480: fc fc 00 00 00 f3 f3 f3 f3 f3 fc fc fc fc fc fc
                   ^
 ffff88809856e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809856e580: fc 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
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