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BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x648/0x1054 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff0000db67a40c by task syz-executor/4306

CPU: 1 PID: 4306 Comm: syz-executor Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 hfsplus_uni2asc+0x648/0x1054 fs/hfsplus/unicode.c:179
 hfsplus_readdir+0x638/0xb3c fs/hfsplus/dir.c:207
 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x11c/0x318 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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:585

Allocated by task 4306:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xec/0x178 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x19c/0xb3c fs/hfsplus/dir.c:144
 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x11c/0x318 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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:585

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0xfc/0x948 kernel/rcu/tree.c:2845
 netlink_release+0x1260/0x1710 net/netlink/af_netlink.c:800
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1400
 __fput+0x1bc/0x7c0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000db67a000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1036 bytes inside of
 2048-byte region [ffff0000db67a000, ffff0000db67a800)

The buggy address belongs to the physical page:
page:0000000038c86e84 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b678
head:0000000038c86e84 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc00032fca00 dead000000000002 ffff0000c0002900
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000db67a300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000db67a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000db67a400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff0000db67a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000db67a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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