attempt to access beyond end of device
loop5: rw=12288, want=8200, limit=20
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 8919 Comm: syz-executor6 Not tainted 4.17.0-rc3+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
attempt to access beyond end of device
RIP: 0010:n_tty_set_termios+0x2d9/0xe80 drivers/tty/n_tty.c:1782
RSP: 0018:ffff8801cfccf698 EFLAGS: 00010203
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 000000000000000b
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000005
loop5: rw=12288, want=12296, limit=20
RBP: ffff8801cfccf6d0 R08: ffff88018952c180 R09: 0000000000000002
R10: ffff88018952ca08 R11: ffff88018952c180 R12: ffff88018b194880
R13: ffff88018b194c34 R14: 000000000000005d R15: ffff8801cfccf730
FS:  00007f326d3f0700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000702294 CR3: 00000001b2ea7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tty_set_termios+0x7a0/0xac0 drivers/tty/tty_ioctl.c:341
 set_termios+0x41e/0x7d0 drivers/tty/tty_ioctl.c:414
 tty_mode_ioctl+0x855/0xb50 drivers/tty/tty_ioctl.c:749
 n_tty_ioctl_helper+0x54/0x3b0 drivers/tty/tty_ioctl.c:940
 n_tty_ioctl+0x54/0x320 drivers/tty/n_tty.c:2441
 tty_ioctl+0x5e1/0x1870 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007f326d3efc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f326d3f06d4 RCX: 0000000000455979
RDX: 0000000020000040 RSI: 0000000000005402 RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000033e R14: 00000000006f8e70 R15: 0000000000000000
Code: 8b 45 d0 31 ff 83 e0 02 89 c6 89 45 d0 e8 50 4a e1 fd 8b 45 d0 4c 89 f1 48 ba 00 00 00 00 00 fc ff df 85 c0 0f 95 c0 48 c1 e9 03 <0f> b6 14 11 4c 89 f1 83 e1 07 38 ca 7f 08 84 d2 0f 85 96 09 00 
RIP: n_tty_set_termios+0x2d9/0xe80 drivers/tty/n_tty.c:1782 RSP: ffff8801cfccf698
---[ end trace a286f85d339681ec ]---