[v5.15] BUG: unable to handle kernel paging request in udf_fiiter_write_fi

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 1c700860e8bc Linux 5.15.185
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15d40f0c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1ea6d61094f2bc7
dashboard link: https://syzkaller.appspot.com/bug?extid=263382bdd23d3d37f209
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d87dd4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10a8b182580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5b3869563672/disk-1c700860.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/382d7f427d53/vmlinux-1c700860.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c344c3ce2e27/Image-1c700860.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/fea34c72c43a/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+263382...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address dfff800000000005
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
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4026 Comm: syz-executor245 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : udf_fiiter_write_fi+0x178/0xb54 fs/udf/directory.c:406
lr : udf_fiiter_write_fi+0xd8/0xb54 fs/udf/directory.c:402
sp : ffff80001f0074d0
x29: ffff80001f007540 x28: ffff0000dd2218f8 x27: ffff80001f0076f0
x26: dfff800000000000 x25: 1ffff00003e00f12 x24: 0000000000000200
x23: 0000000000000000 x22: ffff0000de6b0158 x21: 0000000000000001
x20: 0000000000000028 x19: ffff80001f007890 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000111a97c4 x15: 000000003b9aca00
x14: 0000000000ff0100 x13: 0000000035a4e900 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff0000db061b40
x8 : 0000000000000005 x7 : 0000000035a4e900 x6 : 000000000000002a
x5 : ffff0000e20201e0 x4 : ffff0000e20201d0 x3 : ffff80000975004c
x2 : 0000000000000010 x1 : 0000000000000000 x0 : 0000000000000003
Call trace:
udf_fiiter_write_fi+0x178/0xb54 fs/udf/directory.c:406
udf_rename+0x960/0xa10 fs/udf/namei.c:860
vfs_rename+0x954/0xdcc fs/namei.c:4832
do_renameat2+0x74c/0xcdc fs/namei.c:4985
__do_sys_renameat2 fs/namei.c:5018 [inline]
__se_sys_renameat2 fs/namei.c:5015 [inline]
__arm64_sys_renameat2+0xe0/0xfc fs/namei.c:5015
__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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 97c39ffa f9400288 9100a114 d343fe88 (387a6908)
---[ end trace 653639ee55d52e56 ]---
----------------
Code disassembly (best guess):
0: 97c39ffa bl 0xffffffffff0e7fe8
4: f9400288 ldr x8, [x20]
8: 9100a114 add x20, x8, #0x28
c: d343fe88 lsr x8, x20, #3
* 10: 387a6908 ldrb w8, [x8, x26] <-- trapping instruction


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