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BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x624/0x1018 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff0000dcd6940c by task syz-executor.0/11364

CPU: 0 PID: 11364 Comm: syz-executor.0 Not tainted 5.15.120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307
 hfsplus_uni2asc+0x624/0x1018 fs/hfsplus/unicode.c:179
 hfsplus_readdir+0x79c/0xf68 fs/hfsplus/dir.c:207
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __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

Allocated by task 11364:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513
 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0x29c/0x4c8 mm/slub.c:4407
 kmalloc include/linux/slab.h:596 [inline]
 hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x1c8/0xf68 fs/hfsplus/dir.c:144
 iterate_dir+0x1f4/0x4e4
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
 __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

Last potentially related work creation:
 kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
 kvfree_call_rcu+0xb8/0x684 kernel/rcu/tree.c:3583
 drop_sysctl_table+0x274/0x3a0 fs/proc/proc_sysctl.c:1680
 unregister_sysctl_table+0x94/0x130 fs/proc/proc_sysctl.c:1718
 unregister_net_sysctl_table+0x20/0x30 net/sysctl_net.c:175
 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7087 [inline]
 addrconf_exit_net+0x90/0x1c0 net/ipv6/addrconf.c:7194
 ops_exit_list net/core/net_namespace.c:169 [inline]
 cleanup_net+0x568/0x9bc net/core/net_namespace.c:596
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
 worker_thread+0x910/0x1034 kernel/workqueue.c:2454
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

The buggy address belongs to the object at ffff0000dcd69000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1036 bytes inside of
 2048-byte region [ffff0000dcd69000, ffff0000dcd69800)
The buggy address belongs to the page:
page:000000008c8dd4b1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11cd68
head:000000008c8dd4b1 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002900
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dcd69300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dcd69380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000dcd69400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff0000dcd69480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000dcd69500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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