Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 3 UID: 0 PID: 7253 Comm: syz.3.352 Not tainted 6.16.0-rc3-syzkaller-00329-gdfba48a70cb6 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:bcsp_recv+0x10a/0x17f0 drivers/bluetooth/hci_bcsp.c:590
Code: 18 48 c1 e8 03 48 01 e8 48 89 04 24 48 8d 83 78 01 00 00 48 89 44 24 28 48 c1 e8 03 48 89 44 24 08 e8 8a 03 51 f9 48 8b 04 24 <80> 38 00 0f 85 d1 12 00 00 4c 8b ab 08 01 00 00 31 ff 4c 89 ee e8
RSP: 0018:ffffc90002c27b98 EFLAGS: 00010293
RAX: dffffc0000000021 RBX: 0000000000000000 RCX: ffffffff886a88fa
RDX: ffff8880243e8000 RSI: ffffffff886a8946 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000001e R12: ffffc90002c27d30
R13: ffffc90002c27d30 R14: 0000000000000001 R15: ffff88804dee0000
FS:  0000000000000000(0000) GS:ffff88809785f000(0063) knlGS:00000000f506db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f71a3800 CR3: 0000000050695000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hci_uart_tty_receive+0x251/0x7e0 drivers/bluetooth/hci_ldisc.c:627
 tiocsti drivers/tty/tty_io.c:2290 [inline]
 tty_ioctl+0x583/0x1640 drivers/tty/tty_io.c:2706
 tty_compat_ioctl+0x24a/0x4d0 drivers/tty/tty_io.c:2942
 __do_compat_sys_ioctl fs/ioctl.c:1005 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:948 [inline]
 __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:948
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf709e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f506d55c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000005412
RDX: 0000000080000040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bcsp_recv+0x10a/0x17f0 drivers/bluetooth/hci_bcsp.c:590
Code: 18 48 c1 e8 03 48 01 e8 48 89 04 24 48 8d 83 78 01 00 00 48 89 44 24 28 48 c1 e8 03 48 89 44 24 08 e8 8a 03 51 f9 48 8b 04 24 <80> 38 00 0f 85 d1 12 00 00 4c 8b ab 08 01 00 00 31 ff 4c 89 ee e8
RSP: 0018:ffffc90002c27b98 EFLAGS: 00010293
RAX: dffffc0000000021 RBX: 0000000000000000 RCX: ffffffff886a88fa
RDX: ffff8880243e8000 RSI: ffffffff886a8946 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000001e R12: ffffc90002c27d30
R13: ffffc90002c27d30 R14: 0000000000000001 R15: ffff88804dee0000
FS:  0000000000000000(0000) GS:ffff88809785f000(0063) knlGS:00000000f506db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f71a3800 CR3: 0000000050695000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	18 48 c1             	sbb    %cl,-0x3f(%rax)
   3:	e8 03 48 01 e8       	call   0xe801480b
   8:	48 89 04 24          	mov    %rax,(%rsp)
   c:	48 8d 83 78 01 00 00 	lea    0x178(%rbx),%rax
  13:	48 89 44 24 28       	mov    %rax,0x28(%rsp)
  18:	48 c1 e8 03          	shr    $0x3,%rax
  1c:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  21:	e8 8a 03 51 f9       	call   0xf95103b0
  26:	48 8b 04 24          	mov    (%rsp),%rax
* 2a:	80 38 00             	cmpb   $0x0,(%rax) <-- trapping instruction
  2d:	0f 85 d1 12 00 00    	jne    0x1304
  33:	4c 8b ab 08 01 00 00 	mov    0x108(%rbx),%r13
  3a:	31 ff                	xor    %edi,%edi
  3c:	4c 89 ee             	mov    %r13,%rsi
  3f:	e8                   	.byte 0xe8