do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
==================================================================
BUG: KASAN: null-ptr-deref in udf_write_fi+0x3e4/0x920
Write of size 18446744073709551572 at addr 0000000000000020 by task syz-executor.1/11717

CPU: 0 PID: 11717 Comm: syz-executor.1 Not tainted 6.1.44-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_report+0xe4/0x4c0 mm/kasan/report.c:398
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 memset+0x40/0x70 mm/kasan/shadow.c:44
 udf_write_fi+0x3e4/0x920
 udf_delete_entry fs/udf/namei.c:577 [inline]
 udf_rename+0x90c/0x10b0 fs/udf/namei.c:1173
 vfs_rename+0x8b8/0xd04 fs/namei.c:4785
 do_renameat2+0x980/0x1040 fs/namei.c:4935
 __do_sys_renameat2 fs/namei.c:4968 [inline]
 __se_sys_renameat2 fs/namei.c:4965 [inline]
 __arm64_sys_renameat2+0xe0/0xfc fs/namei.c:4965
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000003
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000003] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 11717 Comm: syz-executor.1 Tainted: G    B              6.1.44-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : crc_itu_t+0x5c/0x108 lib/crc-itu-t.c:60
lr : crc_itu_t+0x38/0x108 lib/crc-itu-t.c:59
sp : ffff80001f2d7540
x29: ffff80001f2d7550 x28: 0000000000000000 x27: 00000000fffffff0
x26: ffff80001f2d7708 x25: 1ffff00003e5aee1 x24: ffff800012742b80
x23: 000000000000ffd9 x22: dfff800000000000 x21: 000000000000001a
x20: 000000000000001a x19: 0000000057313472 x18: 1fffe000368aa376
x17: ffff80001589d000 x16: ffff8000121156c4 x15: ffff0001b4551bbc
x14: ffff0001b4551bb8 x13: 1fffe000368aa376 x12: 0000000000040000
x11: ff8080000aad0e44 x10: 0000000000000002 x9 : 0000000000000002
x8 : 0000000000000003 x7 : 1fffe000368aa377 x6 : ffff80000827bd84
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000081ae29c
x2 : 000000000000ffda x1 : 000000000000ffda x0 : 0000000000000000
Call trace:
 crc_itu_t+0x5c/0x108 lib/crc-itu-t.c:60
 udf_write_fi+0x4cc/0x920 fs/udf/namei.c:103
 udf_delete_entry fs/udf/namei.c:577 [inline]
 udf_rename+0x90c/0x10b0 fs/udf/namei.c:1173
 vfs_rename+0x8b8/0xd04 fs/namei.c:4785
 do_renameat2+0x980/0x1040 fs/namei.c:4935
 __do_sys_renameat2 fs/namei.c:4968 [inline]
 __se_sys_renameat2 fs/namei.c:4965 [inline]
 __arm64_sys_renameat2+0xe0/0xfc fs/namei.c:4965
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: d003e398 912e0318 d343fea8 12000aa9 (38f66908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	d003e398 	adrp	x24, 0x7c72000
   4:	912e0318 	add	x24, x24, #0xb80
   8:	d343fea8 	lsr	x8, x21, #3
   c:	12000aa9 	and	w9, w21, #0x7
* 10:	38f66908 	ldrsb	w8, [x8, x22] <-- trapping instruction