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Unable to handle kernel NULL pointer dereference at virtual address 00000000
[00000000] *pgd=854fe003, *pmd=fe667003
Internal error: Oops: 80000207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 27201 Comm: syz-executor.0 Not tainted 6.0.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at 0x0
LR is at gsmld_receive_buf+0xc0/0x15c drivers/tty/n_gsm.c:2861
pc : [<00000000>]    lr : [<808eac94>]    psr: 60000013
sp : ec875e28  ip : 826efeb0  fp : ec875e6c
r10: 81de5ca0  r9 : 825d5140  r8 : ec875e7c
r7 : 84825000  r6 : 00000000  r5 : ec875e7d  r4 : ec875e7c
r3 : 00000000  r2 : ec875e7c  r1 : 00000000  r0 : 84825000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 850558c0  DAC: fffffffd
Register r0 information: slab kmalloc-512 start 84825000 pointer offset 0 size 512
Register r1 information: NULL pointer
Register r2 information: 2-page vmalloc region starting at 0xec874000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r3 information: NULL pointer
Register r4 information: 2-page vmalloc region starting at 0xec874000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r5 information: 2-page vmalloc region starting at 0xec874000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r6 information: NULL pointer
Register r7 information: slab kmalloc-512 start 84825000 pointer offset 0 size 512
Register r8 information: 2-page vmalloc region starting at 0xec874000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r9 information: non-slab/vmalloc memory
Register r10 information: non-slab/vmalloc memory
Register r11 information: 2-page vmalloc region starting at 0xec874000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r12 information: non-slab/vmalloc memory
Process syz-executor.0 (pid: 27201, stack limit = 0xec874000)
Stack: (0xec875e28 to 0xec876000)
5e20:                   8067b314 6dc0e663 83f42400 83f42418 81de5bf8 83f42400
5e40: 8500db40 00000000 84fb8340 83f42400 808eabd4 8500db40 20000000 83f43c00
5e60: ec875f14 ec875e70 808dd18c 808eabe0 00000001 8295da50 00000054 8500db00
5e80: 00000003 00000036 ec875ee4 ec875e98 8068af1c 80680e64 00000001 00000054
5ea0: 00000012 ec875eb4 828a8c10 82ef7cc0 ec875412 6dc0e60b ec875ea8 81f4cdc0
5ec0: 20000000 6dc0e663 81f4c0dc 20000000 8500db40 00005412 ec875ef4 ec875ee8
5ee0: 8068b020 6dc0e663 ec875f14 00005412 00000000 8500db41 20000000 8500db40
5f00: 00000003 8295da50 ec875fa4 ec875f18 804b9814 808dc9e4 ec875f34 83125240
5f20: 83125960 00000002 dddd26e8 5bb2a000 822a86f0 83125240 00000002 dddd26e8
5f40: ec875f5c ec875f50 8172d5d8 8172d4a0 ec875f84 ec875f60 8172d0b0 8172d5c8
5f60: 60000013 00000000 0012bfd0 00000036 60000010 6dc0e663 ec875f9c 00000000
5f80: 00000000 0012bfd0 00000036 80200288 83125240 00000036 00000000 ec875fa8
5fa0: 80200060 804b9710 00000000 00000000 00000003 00005412 20000000 00000000
5fc0: 00000000 00000000 0012bfd0 00000036 7e9b93b2 76f6b6d0 7e9b9544 76f6b20c
5fe0: 76f6b020 76f6b010 00016420 0004c150 60000010 00000003 00000000 00000000
Backtrace: 
[<808eabd4>] (gsmld_receive_buf) from [<808dd18c>] (tiocsti drivers/tty/tty_io.c:2293 [inline])
[<808eabd4>] (gsmld_receive_buf) from [<808dd18c>] (tty_ioctl+0x7b4/0xa6c drivers/tty/tty_io.c:2692)
 r10:83f43c00 r9:20000000 r8:8500db40 r7:808eabd4 r6:83f42400 r5:84fb8340
 r4:00000000
[<808dc9d8>] (tty_ioctl) from [<804b9814>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<808dc9d8>] (tty_ioctl) from [<804b9814>] (do_vfs_ioctl fs/ioctl.c:830 [inline])
[<808dc9d8>] (tty_ioctl) from [<804b9814>] (__do_sys_ioctl fs/ioctl.c:868 [inline])
[<808dc9d8>] (tty_ioctl) from [<804b9814>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856)
 r10:8295da50 r9:00000003 r8:8500db40 r7:20000000 r6:8500db41 r5:00000000
 r4:00005412
[<804b9704>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0xec875fa8 to 0xec875ff0)
5fa0:                   00000000 00000000 00000003 00005412 20000000 00000000
5fc0: 00000000 00000000 0012bfd0 00000036 7e9b93b2 76f6b6d0 7e9b9544 76f6b20c
5fe0: 76f6b020 76f6b010 00016420 0004c150
 r10:00000036 r9:83125240 r8:80200288 r7:00000036 r6:0012bfd0 r5:00000000
 r4:00000000
Code: bad PC value
---[ end trace 0000000000000000 ]---