kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1408 Comm: syz-executor.4 Not tainted 5.4.242-syzkaller-00085-g6d5c2c1877e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:hci_uart_tty_ioctl+0x32b/0xa40 drivers/bluetooth/hci_ldisc.c:769
Code: fe 4c 89 f3 48 81 c3 88 00 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 2f 18 6c fe 48 8b 1b 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 66 06 00 00 8b 2b 89 e8 48 83 c4 30 5b 41
RSP: 0018:ffff8881d414fc10 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881d422cec0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8327cba9 R09: ffffed103b9e1484
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8881eccbf800 R14: ffff8881dcf0a400 R15: 00000000800455c9
FS:  00007feb7ba7e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ea6b19d58 CR3: 00000001efbd6000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tty_ioctl+0x954/0xcb0 drivers/tty/tty_io.c:2668
 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace 2ce9e18e5d16a7f3 ]---
RIP: 0010:hci_uart_tty_ioctl+0x32b/0xa40 drivers/bluetooth/hci_ldisc.c:769
Code: fe 4c 89 f3 48 81 c3 88 00 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 2f 18 6c fe 48 8b 1b 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 66 06 00 00 8b 2b 89 e8 48 83 c4 30 5b 41
RSP: 0018:ffff8881d414fc10 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881d422cec0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8327cba9 R09: ffffed103b9e1484
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff8881eccbf800 R14: ffff8881dcf0a400 R15: 00000000800455c9
FS:  00007feb7ba7e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001efbd6000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fe 4c 89 f3          	decb   -0xd(%rcx,%rcx,4)
   4:	48 81 c3 88 00 00 00 	add    $0x88,%rbx
   b:	48 89 d8             	mov    %rbx,%rax
   e:	48 c1 e8 03          	shr    $0x3,%rax
  12:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 2f 18 6c fe       	call   0xfe6c184f
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 66 06 00 00    	jne    0x69c
  36:	8b 2b                	mov    (%rbx),%ebp
  38:	89 e8                	mov    %ebp,%eax
  3a:	48 83 c4 30          	add    $0x30,%rsp
  3e:	5b                   	pop    %rbx
  3f:	41                   	rex.B