BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
IP: set_bit arch/x86/include/asm/bitops.h:76 [inline]
IP: amp_read_loc_assoc_final_data+0xe6/0x190 net/bluetooth/amp.c:312
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 8034 Comm: kworker/u5:4 Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci4 hci_rx_work
task: ffff8880956e8540 task.stack: ffff8880b09d8000
RIP: 0010:set_bit arch/x86/include/asm/bitops.h:76 [inline]
RIP: 0010:amp_read_loc_assoc_final_data+0xe6/0x190 net/bluetooth/amp.c:312
RSP: 0018:ffff8880b09dfa08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1101613bf41 RCX: 1ffff11012add1c3
RDX: 1ffff110167569f3 RSI: ffff888096274940 RDI: ffff8880b3ab4f98
RBP: ffff888096274940 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880956e8540 R12: ffff8880b3ab4c00
R13: 0000000000000000 R14: ffff8880b3ab4c00 R15: ffff88809bd0a680
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
base_sock_release(ffff88807274b600) sk=          (null)
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000030 CR3: 000000009b3b3000 CR4: 00000000001406f0
DR0: 0000000000000800 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 hci_chan_selected_evt+0x1b2/0x360 net/bluetooth/hci_event.c:4333
 hci_event_packet+0x2260/0x7510 net/bluetooth/hci_event.c:5441
base_sock_release(ffff88807853e940) sk=          (null)
 hci_rx_work+0x427/0xb40 net/bluetooth/hci_core.c:4244
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
base_sock_release(ffff88809f29d100) sk=ffff88809076b480
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
base_sock_release(ffff888070e3c480) sk=          (null)
base_sock_release(ffff888077e16200) sk=          (null)
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 44 24 21 48 b8 00 00 00 00 00 fc ff df 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 90 00 00 00 41 0f b7 84 24 98 03 00 00 66 89 44 24 23 <f0> 41 80 4d 30 04 48 8d 6c 24 40 4c 89 e6 48 89 ef e8 14 6c fe 
base_sock_release(ffff8880717e6a80) sk=ffff88809b0863c0
RIP: set_bit arch/x86/include/asm/bitops.h:76 [inline] RSP: ffff8880b09dfa08
RIP: amp_read_loc_assoc_final_data+0xe6/0x190 net/bluetooth/amp.c:312 RSP: ffff8880b09dfa08
CR2: 0000000000000030
---[ end trace 4b2d9c8801d48187 ]---