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Unable to handle kernel NULL pointer dereference at virtual address 00000000
[00000000] *pgd=8511e003, *pmd=fe7e2003
Internal error: Oops: 80000207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 8529 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 : ec241e28  ip : 826efeb0  fp : ec241e6c
r10: 81de5ca0  r9 : 825d5140  r8 : ec241e7c
r7 : 82950c00  r6 : 00000000  r5 : ec241e7d  r4 : ec241e7c
r3 : 00000000  r2 : ec241e7c  r1 : 00000000  r0 : 82950c00
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 83eeff80  DAC: 00000000
Register r0 information: slab kmalloc-512 start 82950c00 pointer offset 0 size 512
Register r1 information: NULL pointer
Register r2 information: 2-page vmalloc region starting at 0xec240000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r3 information: NULL pointer
Register r4 information: 2-page vmalloc region starting at 0xec240000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r5 information: 2-page vmalloc region starting at 0xec240000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r6 information: NULL pointer
Register r7 information: slab kmalloc-512 start 82950c00 pointer offset 0 size 512
Register r8 information: 2-page vmalloc region starting at 0xec240000 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 0xec240000 allocated at kernel_clone+0x9c/0x440 kernel/fork.c:2673
Register r12 information: non-slab/vmalloc memory
Process syz-executor.1 (pid: 8529, stack limit = 0xec240000)
Stack: (0xec241e28 to 0xec242000)
1e20:                   8067b314 2c936fa8 851a2e00 851a2e18 81de5bf8 851a2e00
1e40: 84f59900 00000000 84a1dc80 851a2e00 808eabd4 84f59900 20000000 851a2c00
1e60: ec241f14 ec241e70 808dd18c 808eabe0 00000001 83318050 00000054 84f59900
1e80: 00000003 00000036 ec241ee4 ec241e98 8068af1c 80680e64 00000001 00000054
1ea0: 00000012 ec241eb4 832d9c10 82ccf2a8 ec245412 2c936f0b ec241ea8 81f4cdc0
1ec0: 20000000 2c936fa8 81f4c0dc 20000000 84f59900 00005412 ec241ef4 ec241ee8
1ee0: 8068b020 2c936fa8 ec241f14 00005412 00000000 84f59901 20000000 84f59900
1f00: 00000003 83318050 ec241fa4 ec241f18 804b9814 808dc9e4 ec241f34 83cd5240
1f20: 83cd5960 00000002 ddde36e8 5bb3b000 822a86f0 83cd5240 00000002 ddde36e8
1f40: ec241f5c ec241f50 8172d5d8 8172d4a0 ec241f84 ec241f60 8172d0b0 8172d5c8
1f60: 60000013 00000000 0012bfd0 00000036 60000010 2c936fa8 ec241f9c 00000000
1f80: 00000000 0012bfd0 00000036 80200288 83cd5240 00000036 00000000 ec241fa8
1fa0: 80200060 804b9710 00000000 00000000 00000003 00005412 20000000 00000000
1fc0: 00000000 00000000 0012bfd0 00000036 7e8123b2 76f256d0 7e812544 76f2520c
1fe0: 76f25020 76f25010 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)
 r10:851a2c00 r9:20000000 r8:84f59900 r7:808eabd4 r6:851a2e00 r5:84a1dc80
 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)
 r10:83318050 r9:00000003 r8:84f59900 r7:20000000 r6:84f59901 r5:00000000
 r4:00005412
[<804b9704>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0xec241fa8 to 0xec241ff0)
1fa0:                   00000000 00000000 00000003 00005412 20000000 00000000
1fc0: 00000000 00000000 0012bfd0 00000036 7e8123b2 76f256d0 7e812544 76f2520c
1fe0: 76f25020 76f25010 00016420 0004c150
 r10:00000036 r9:83cd5240 r8:80200288 r7:00000036 r6:0012bfd0 r5:00000000
 r4:00000000
Code: bad PC value
---[ end trace 0000000000000000 ]---