KASAN: user-memory-access Write in batadv_purge_orig

netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'.
device bond3 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): bond3: link is not ready
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BUG: KASAN: user-memory-access in atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
BUG: KASAN: user-memory-access in __lock_acquire+0x251/0x3ff0 kernel/locking/lockdep.c:3308
8021q: adding VLAN 0 to HW filter on device bond3
Write of size 4 at addr 0000770007700138 by task kworker/u4:3/28203

CPU: 1 PID: 28203 Comm: kworker/u4:3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_purge_orig
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 kasan_report_error.cold+0x15b/0x1b9 mm/kasan/report.c:352
netlink: 88 bytes leftover after parsing attributes in process `syz-executor.0'.
 kasan_report+0x8f/0xa0 mm/kasan/report.c:412
 atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
 __lock_acquire+0x251/0x3ff0 kernel/locking/lockdep.c:3308
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 batadv_purge_orig_ref+0x16d/0x1110 net/batman-adv/originator.c:1363
 batadv_purge_orig+0x17/0x60 net/batman-adv/originator.c:1392
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
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