do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
==================================================================
BUG: KASAN: null-ptr-deref in udf_write_fi+0x3e4/0x9c0
Write of size 18446744073709551572 at addr 0000000000000020 by task syz-executor770/3965

CPU: 1 PID: 3965 Comm: syz-executor770 Not tainted 5.15.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0x168/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memset+0x58/0x88 mm/kasan/shadow.c:44
 udf_write_fi+0x3e4/0x9c0
 udf_delete_entry fs/udf/namei.c:577 [inline]
 udf_rename+0x90c/0x10b0 fs/udf/namei.c:1173
 vfs_rename+0x9e0/0xe80 fs/namei.c:4736
 do_renameat2+0x980/0x1040 fs/namei.c:4887
 __do_sys_renameat fs/namei.c:4927 [inline]
 __se_sys_renameat fs/namei.c:4924 [inline]
 __arm64_sys_renameat+0xc8/0xe4 fs/namei.c:4924
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000003
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: 96000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3965 Comm: syz-executor770 Tainted: G    B             5.15.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
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 : ffff80001a8d7500
x29: ffff80001a8d7510 x28: 0000000000000000 x27: 00000000fffffff0
x26: ffff80001a8d76c8 x25: 1ffff0000351aed9 x24: ffff800011f52540
x23: 000000000000ffd9 x22: dfff800000000000 x21: 000000000000001a
x20: 000000000000001a x19: 00000000a79d5f14 x18: 1fffe0003690378e
x17: 1fffe0003690378e x16: ffff80001194ffd4 x15: ffff80001497f100
x14: ffff0001b481bc80 x13: ffffffffffffffff x12: 0000000000000000
x11: ff8080000a9ab690 x10: 0000000000000000 x9 : 0000000000000002
x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff800008268c6c
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80000819b8b0
x2 : 000000000000ffda x1 : 000000000000ffda x0 : 0000000000000000
Call trace:
 crc_itu_t+0x5c/0x108 lib/crc-itu-t.c:60
 udf_write_fi+0x540/0x9c0
 udf_delete_entry fs/udf/namei.c:577 [inline]
 udf_rename+0x90c/0x10b0 fs/udf/namei.c:1173
 vfs_rename+0x9e0/0xe80 fs/namei.c:4736
 do_renameat2+0x980/0x1040 fs/namei.c:4887
 __do_sys_renameat fs/namei.c:4927 [inline]
 __se_sys_renameat fs/namei.c:4924 [inline]
 __arm64_sys_renameat+0xc8/0xe4 fs/namei.c:4924
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: f003ad38 91150318 d343fea8 12000aa9 (38f66908) 
---[ end trace 19f87059c62af2e8 ]---
----------------
Code disassembly (best guess):
   0:	f003ad38 	adrp	x24, 0x75a7000
   4:	91150318 	add	x24, x24, #0x540
   8:	d343fea8 	lsr	x8, x21, #3
   c:	12000aa9 	and	w9, w21, #0x7
* 10:	38f66908 	ldrsb	w8, [x8, x22] <-- trapping instruction