Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
  ESR = 0x0000000086000006
  EC = 0x21: IABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001bd2f4000
[0000000000000000] pgd=080000017d923003, p4d=080000017d923003, pud=08000001bc375003, pmd=0000000000000000
Internal error: Oops: 86000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 28312 Comm: syz-executor.5 Not tainted 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : gsmld_receive_buf+0x140/0x214 drivers/tty/n_gsm.c:2861
sp : ffff8000143a3cb0
x29: ffff8000143a3cc0 x28: 0000000000000000 x27: 0000000000000000
x26: 0000000000000000 x25: 0000000000000000
 x24: ffff80000d937000

x23: ffff80000d681dd0 x22: ffff00012860f000 x21: ffff8000143a3d21

x20: ffff80000c205988 x19: ffff8000143a3d24 x18: 0000000000000000

x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000002 x13: 0000000000000004 x12: 0000000000040000
x11: 0000000000000781 x10: ffff800012e58000 x9 : ffff8000098e4c20
x8 : 0000000000000000 x7 : ffff8000098d9cc0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : ffff8000143a3d20 x1 : 0000000000000000 x0 : ffff00012860f000
Call trace:
 0x0
 tiocsti+0x168/0x1c4 drivers/tty/tty_io.c:2293
 tty_ioctl+0x284/0x9f4 drivers/tty/tty_io.c:2692
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x154 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
 el0t_64_sync+0x18c/0x190
Code: bad PC value
---[ end trace 0000000000000000 ]---