[v6.1] BUG: unable to handle kernel paging request in ext4_quota_read

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: fa74641fb6b9 Linux 6.1.29
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12e22919280000
kernel config: https://syzkaller.appspot.com/x/.config?x=7454aa89ac475d7b
dashboard link: https://syzkaller.appspot.com/bug?extid=157b8930f5de4714c2a6
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167810a9280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53e4da6b145c/disk-fa74641f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/adeb1a2cfa86/vmlinux-fa74641f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c976f1155d08/Image-fa74641f.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f2832e7e3e20/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+157b89...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address dfff80000000000a
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
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
[dfff80000000000a] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 16451 Comm: syz-executor.2 Not tainted 6.1.29-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 : i_size_read include/linux/fs.h:864 [inline]
pc : ext4_quota_read+0xb4/0x294 fs/ext4/super.c:7072
lr : ext4_quota_read+0xac/0x294 fs/ext4/super.c:7067
sp : ffff800020a16e90
x29: ffff800020a16ea0 x28: 0000000000000400 x27: dfff800000000000
x26: dfff800000000000 x25: 0000000000000050 x24: 000000000000000c
x23: ffff0000cc036000 x22: 0000000000000400 x21: 0000000000000400
x20: 0000000000000000 x19: ffff0000c89f4000 x18: 1ffff00004142e64
x17: ffff80001559d000 x16: ffff80001203ab40 x15: 0000000000000000
x14: 00000000120e89bc x13: 00000000a5ae9b40 x12: 0000000000000000
x11: ff80800008f370a0 x10: 0000000000000000 x9 : ffff800008f370a0
x8 : 000000000000000a x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000400 x3 : 0000000000000400
x2 : ffff0000c89f4000 x1 : 000000000000000c x0 : 0000000000000040
Call trace:
i_size_read include/linux/fs.h:864 [inline]
ext4_quota_read+0xb4/0x294 fs/ext4/super.c:7072
read_blk fs/quota/quota_tree.c:55 [inline]
do_insert_tree+0x1c4/0x1474 fs/quota/quota_tree.c:347
dq_insert_tree fs/quota/quota_tree.c:401 [inline]
qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:420
v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:444
ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6762
dqget+0x844/0xc48 fs/quota/dquot.c:914
__dquot_initialize+0x344/0xb54 fs/quota/dquot.c:1492
dquot_initialize fs/quota/dquot.c:1550 [inline]
dquot_file_open+0x90/0xc8 fs/quota/dquot.c:2181
ext4_file_open+0x200/0x540 fs/ext4/file.c:893
do_dentry_open+0x734/0xfa0 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3557 [inline]
path_openat+0x1e14/0x2548 fs/namei.c:3714
do_filp_open+0x1bc/0x3cc fs/namei.c:3741
do_sys_openat2+0x128/0x3d8 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_openat fs/open.c:1342 [inline]
__se_sys_openat fs/open.c:1337 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1337
__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: 54000ea8 97d70fc1 91014299 d343ff28 (387b6908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 54000ea8 b.hi 0x1d4 // b.pmore
4: 97d70fc1 bl 0xffffffffff5c3f08
8: 91014299 add x25, x20, #0x50
c: d343ff28 lsr x8, x25, #3
* 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction


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