hfsplus: invalid length 65281 has been corrected to 255
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_strcasecmp+0x19c/0x42c fs/hfsplus/unicode.c:47
Read of size 2 at addr ffff0000d93fd40c by task syz-executor/6546

CPU: 1 UID: 0 PID: 6546 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #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_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
 hfsplus_strcasecmp+0x19c/0x42c fs/hfsplus/unicode.c:47
 hfsplus_cat_case_cmp_key+0xa4/0x168 fs/hfsplus/catalog.c:26
 hfs_find_rec_by_key+0xa8/0x1ec fs/hfsplus/bfind.c:89
 __hfsplus_brec_find+0x148/0x3cc fs/hfsplus/bfind.c:124
 hfsplus_brec_find+0x20c/0x448 fs/hfsplus/bfind.c:184
 hfsplus_brec_read+0x38/0x12c fs/hfsplus/bfind.c:211
 hfsplus_lookup+0x25c/0x728 fs/hfsplus/dir.c:52
 __lookup_slow+0x254/0x378 fs/namei.c:1808
 lookup_slow+0x5c/0x80 fs/namei.c:1825
 walk_component+0x270/0x364 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2654
 filename_lookup+0x1ac/0x454 fs/namei.c:2683
 user_path_at+0x50/0x74 fs/namei.c:3127
 ksys_umount fs/namespace.c:2115 [inline]
 __do_sys_umount fs/namespace.c:2123 [inline]
 __se_sys_umount fs/namespace.c:2121 [inline]
 __arm64_sys_umount+0xf0/0x174 fs/namespace.c:2121
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Allocated by task 6546:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_noprof+0x2fc/0x4c8 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21
 hfsplus_lookup+0x15c/0x728 fs/hfsplus/dir.c:44
 __lookup_slow+0x254/0x378 fs/namei.c:1808
 lookup_slow+0x5c/0x80 fs/namei.c:1825
 walk_component+0x270/0x364 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2654
 filename_lookup+0x1ac/0x454 fs/namei.c:2683
 user_path_at+0x50/0x74 fs/namei.c:3127
 ksys_umount fs/namespace.c:2115 [inline]
 __do_sys_umount fs/namespace.c:2123 [inline]
 __se_sys_umount fs/namespace.c:2121 [inline]
 __arm64_sys_umount+0xf0/0x174 fs/namespace.c:2121
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the object at ffff0000d93fd000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
 allocated 1036-byte region [ffff0000d93fd000, ffff0000d93fd40c)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1193f8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc364fe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d93fd300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d93fd380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d93fd400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff0000d93fd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d93fd500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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