exfat: Deprecated parameter 'utf8'
exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x9c633569, utbl_chksum : 0xe619d30d)
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BUG: KASAN: stack-out-of-bounds in exfat_nls_to_ucs2 fs/exfat/nls.c:619 [inline]
BUG: KASAN: stack-out-of-bounds in exfat_nls_to_utf16+0x8a8/0x9c8 fs/exfat/nls.c:647
Read of size 1 at addr ffff8000a04e7550 by task syz.0.29/6773

CPU: 0 UID: 0 PID: 6773 Comm: syz.0.29 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 exfat_nls_to_ucs2 fs/exfat/nls.c:619 [inline]
 exfat_nls_to_utf16+0x8a8/0x9c8 fs/exfat/nls.c:647
 exfat_ioctl_set_volume_label fs/exfat/file.c:524 [inline]
 exfat_ioctl+0x7e0/0x10e8 fs/exfat/file.c:554
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to stack of task syz.0.29/6773
 and is located at offset 304 in frame:
 exfat_cont_expand fs/exfat/file.c:-1 [inline]
 exfat_ioctl+0x0/0x10e8 fs/exfat/file.c:295

This frame has 7 objects:
 [32, 36) 'lossy.i'
 [48, 304) 'label.i105'
 [368, 888) 'uniname.i106'
 [1024, 1280) 'label.i'
 [1344, 1864) 'uniname.i'
 [2000, 2024) 'range.i'
 [2064, 2144) 'ia.i'

The buggy address belongs to a 8-page vmalloc region starting at 0xffff8000a04e0000 allocated at copy_process+0x480/0x31e4 kernel/fork.c:2012
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x137219
memcg:ffff0000d4a03082
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000d4a03082
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8000a04e7400: 00 00 00 00 f1 f1 f1 f1 04 f2 00 00 00 00 00 00
 ffff8000a04e7480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8000a04e7500: 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 f2
                                                 ^
 ffff8000a04e7580: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8000a04e7600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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