Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 1 UID: 0 PID: 7929 Comm: syz.4.448 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:bcsp_recv+0x13d/0x1740
Code: 89 4c 24 40 48 89 54 24 28 48 c1 ea 03 48 89 54 24 68 48 89 5c 24 20 48 c1 eb 03 48 89 5c 24 60 4c 89 7c 24 38 48 8b 44 24 58 <42> 80 3c 30 00 74 08 4c 89 ff e8 84 e2 b8 f9 49 8b 1f 31 ff 48 89
RSP: 0018:ffffc90003777c00 EFLAGS: 00010206
RAX: 0000000000000021 RBX: 0000000000000030 RCX: 000000000000002f
RDX: 000000000000002f RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003777d60 R08: ffff88810f95ec1f R09: 1ffff11021f2bd83
R10: dffffc0000000000 R11: ffffffff886a38d0 R12: 0000000000000001
R13: ffffc90003777e00 R14: dffffc0000000000 R15: 0000000000000108
FS:  00007f76d33d56c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76d33d4fc8 CR3: 0000000042cf6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hci_uart_tty_receive+0x194/0x220
 tiocsti+0x23c/0x2c0
 tty_ioctl+0x626/0xde0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76d518ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76d33d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f76d53c6090 RCX: 00007f76d518ebe9
RDX: 0000200000000140 RSI: 0000000000005412 RDI: 0000000000000005
RBP: 00007f76d5211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76d53c6128 R14: 00007f76d53c6090 R15: 00007fff5d929118
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bcsp_recv+0x13d/0x1740
Code: 89 4c 24 40 48 89 54 24 28 48 c1 ea 03 48 89 54 24 68 48 89 5c 24 20 48 c1 eb 03 48 89 5c 24 60 4c 89 7c 24 38 48 8b 44 24 58 <42> 80 3c 30 00 74 08 4c 89 ff e8 84 e2 b8 f9 49 8b 1f 31 ff 48 89
RSP: 0018:ffffc90003777c00 EFLAGS: 00010206
RAX: 0000000000000021 RBX: 0000000000000030 RCX: 000000000000002f
RDX: 000000000000002f RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003777d60 R08: ffff88810f95ec1f R09: 1ffff11021f2bd83
R10: dffffc0000000000 R11: ffffffff886a38d0 R12: 0000000000000001
R13: ffffc90003777e00 R14: dffffc0000000000 R15: 0000000000000108
FS:  00007f76d33d56c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda9c9c1000 CR3: 0000000042cf6000 CR4: 00000000000006f0
