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Unable to handle kernel NULL pointer dereference at virtual address 00000000
[00000000] *pgd=851a8003, *pmd=eea35003
Internal error: Oops: 80000207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 23453 Comm: syz-executor.1 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 : ed789e28  ip : 826efeb0  fp : ed789e6c
r10: 81de5ca0  r9 : 825d5140  r8 : ed789e7c
r7 : 82b0f000  r6 : 00000000  r5 : ed789e7d  r4 : ed789e7c
r3 : 00000000  r2 : ed789e7c  r1 : 00000000  r0 : 82b0f000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 85693b00  DAC: 00000000
Register r0 information: slab kmalloc-512 start 82b0f000 pointer offset 0 size 512
Register r1 information: NULL pointer
Register r2 information: 2-page vmalloc region starting at 0xed788000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r3 information: NULL pointer
Register r4 information: 2-page vmalloc region starting at 0xed788000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r5 information: 2-page vmalloc region starting at 0xed788000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r6 information: NULL pointer
Register r7 information: slab kmalloc-512 start 82b0f000 pointer offset 0 size 512
Register r8 information: 2-page vmalloc region starting at 0xed788000 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 0xed788000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r12 information: non-slab/vmalloc memory
Process syz-executor.1 (pid: 23453, stack limit = 0xed788000)
Stack: (0xed789e28 to 0xed78a000)
9e20:                   8067b314 cd5320af 842bb200 842bb218 81de5bf8 842bb200
9e40: 85ae0900 00000000 852cef40 842bb200 808eabd4 85ae0900 20000000 842bae00
9e60: ed789f14 ed789e70 808dd18c 808eabe0 00000001 8294ce50 00000054 85ae0900
9e80: 00000003 00000036 ed789ee4 ed789e98 8068af1c 80680e64 00000001 00000054
9ea0: 00000012 ed789eb4 83940490 8342fbb0 ed785412 cd53200b ed789ea8 81f4cdc0
9ec0: 20000000 cd5320af 81f4c0dc 20000000 85ae0900 00005412 ed789ef4 ed789ee8
9ee0: 8068b020 cd5320af ed789f14 00005412 00000000 85ae0901 20000000 85ae0900
9f00: 00000003 8294ce50 ed789fa4 ed789f18 804b9814 808dc9e4 ed789f34 83eb0000
9f20: 83eb0720 00000002 ddde36e8 5bb3b000 822a86f0 83eb0000 00000002 ddde36e8
9f40: ed789f5c ed789f50 8172d5d8 8172d4a0 ed789f84 ed789f60 8172d0b0 8172d5c8
9f60: 60000013 00000000 0012bfd0 00000036 60000010 cd5320af ed789f9c 00000000
9f80: 00000000 0012bfd0 00000036 80200288 83eb0000 00000036 00000000 ed789fa8
9fa0: 80200060 804b9710 00000000 00000000 00000003 00005412 20000000 00000000
9fc0: 00000000 00000000 0012bfd0 00000036 7efc03b2 76f046d0 7efc0544 76f0420c
9fe0: 76f04020 76f04010 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)
 r10:842bae00 r9:20000000 r8:85ae0900 r7:808eabd4 r6:842bb200 r5:852cef40
 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)
 r10:8294ce50 r9:00000003 r8:85ae0900 r7:20000000 r6:85ae0901 r5:00000000
 r4:00005412
[<804b9704>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0xed789fa8 to 0xed789ff0)
9fa0:                   00000000 00000000 00000003 00005412 20000000 00000000
9fc0: 00000000 00000000 0012bfd0 00000036 7efc03b2 76f046d0 7efc0544 76f0420c
9fe0: 76f04020 76f04010 00016420 0004c150
 r10:00000036 r9:83eb0000 r8:80200288 r7:00000036 r6:0012bfd0 r5:00000000
 r4:00000000
Code: bad PC value
---[ end trace 0000000000000000 ]---