Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f]
CPU: 0 UID: 0 PID: 6395 Comm: syz.1.241 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:keyspan_break_ctl+0x83/0xc0
Code: 63 b6 8b fa 41 be 9c 00 00 00 4d 03 37 bf ff ff ff ff 89 ee e8 8e 21 1b fa 45 31 ff 83 fd ff 41 0f 94 c7 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 1d 45 89 3e 48 89 df 31 f6 e8 57 c3 00 00
RSP: 0018:ffffc9000bdffe08 EFLAGS: 00010203
RAX: 0000000000000013 RBX: ffff8881b2b78000 RCX: ffff88810b6f8000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff917a287f R09: 1ffffffff22f450f
R10: dffffc0000000000 R11: ffffffff87ac99d0 R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000000009c R15: 0000000000000000
FS:  00007fec2cdef6c0(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32621ff8 CR3: 00000001144b6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 send_break+0x222/0x300
 tty_ioctl+0xd0f/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fec2bf9e1d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec2cdef028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fec2c225fa0 RCX: 00007fec2bf9e1d9
RDX: 0000000000000007 RSI: 0000000000005425 RDI: 0000000000000004
RBP: 00007fec2c035888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec2c226038 R14: 00007fec2c225fa0 R15: 00007ffe9ad13178
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:keyspan_break_ctl+0x83/0xc0
Code: 63 b6 8b fa 41 be 9c 00 00 00 4d 03 37 bf ff ff ff ff 89 ee e8 8e 21 1b fa 45 31 ff 83 fd ff 41 0f 94 c7 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 1d 45 89 3e 48 89 df 31 f6 e8 57 c3 00 00
RSP: 0018:ffffc9000bdffe08 EFLAGS: 00010203
RAX: 0000000000000013 RBX: ffff8881b2b78000 RCX: ffff88810b6f8000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff917a287f R09: 1ffffffff22f450f
R10: dffffc0000000000 R11: ffffffff87ac99d0 R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000000009c R15: 0000000000000000
FS:  00007fec2cdef6c0(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32621ff8 CR3: 00000001144b6000 CR4: 00000000000006f0
