hfsplus: invalid length 65281 has been corrected to 255
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BUG: KASAN: slab-out-of-bounds in hfsplus_strcasecmp+0x1bc/0x490 fs/hfsplus/unicode.c:47
Read of size 2 at addr ffff888020afd40c by task syz-executor/5871

CPU: 0 UID: 0 PID: 5871 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 hfsplus_strcasecmp+0x1bc/0x490 fs/hfsplus/unicode.c:47
 hfs_find_rec_by_key+0xa9/0x1e0 fs/hfsplus/bfind.c:89
 __hfsplus_brec_find+0x18e/0x480 fs/hfsplus/bfind.c:124
 hfsplus_brec_find+0x289/0x500 fs/hfsplus/bfind.c:184
 hfsplus_brec_read+0x2b/0x120 fs/hfsplus/bfind.c:211
 hfsplus_lookup+0x2aa/0x890 fs/hfsplus/dir.c:52
 __lookup_slow+0x297/0x3d0 fs/namei.c:1808
 lookup_slow+0x53/0x70 fs/namei.c:1825
 walk_component+0x2d2/0x400 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2654
 filename_lookup+0x212/0x570 fs/namei.c:2683
 user_path_at+0x3a/0x60 fs/namei.c:3127
 ksys_umount fs/namespace.c:2112 [inline]
 __do_sys_umount fs/namespace.c:2120 [inline]
 __se_sys_umount fs/namespace.c:2118 [inline]
 __x64_sys_umount+0xee/0x160 fs/namespace.c:2118
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f995698ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe631abc98 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f9956a11c05 RCX: 00007f995698ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe631abd50
RBP: 00007ffe631abd50 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe631ace40
R13: 00007f9956a11c05 R14: 0000000000109e2e R15: 00007ffe631adf10
 </TASK>

Allocated by task 5871:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfsplus_find_init+0x8c/0x1d0 fs/hfsplus/bfind.c:21
 hfsplus_lookup+0x19c/0x890 fs/hfsplus/dir.c:44
 __lookup_slow+0x297/0x3d0 fs/namei.c:1808
 lookup_slow+0x53/0x70 fs/namei.c:1825
 walk_component+0x2d2/0x400 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2654
 filename_lookup+0x212/0x570 fs/namei.c:2683
 user_path_at+0x3a/0x60 fs/namei.c:3127
 ksys_umount fs/namespace.c:2112 [inline]
 __do_sys_umount fs/namespace.c:2120 [inline]
 __se_sys_umount fs/namespace.c:2118 [inline]
 __x64_sys_umount+0xee/0x160 fs/namespace.c:2118
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888020afd000
 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 [ffff888020afd000, ffff888020afd40c)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20af8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a442000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a442000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea000082be01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 2218951394, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4391
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 acpi_ds_create_walk_state+0xd9/0x270 drivers/acpi/acpica/dswstate.c:518
 acpi_ps_execute_method+0x220/0x7c0 drivers/acpi/acpica/psxface.c:134
 acpi_ns_evaluate+0x5a6/0xa20 drivers/acpi/acpica/nseval.c:205
 acpi_evaluate_object+0x53f/0xa10 drivers/acpi/acpica/nsxfeval.c:354
 map_mat_entry drivers/acpi/processor_core.c:241 [inline]
 acpi_get_phys_id+0xa9/0x9e0 drivers/acpi/processor_core.c:274
 acpi_get_cpuid+0x30/0x1f0 drivers/acpi/processor_core.c:332
 processor_physically_present+0x19a/0x1b0 drivers/acpi/acpi_processor.c:565
 acpi_processor_osc+0xde/0x290 drivers/acpi/acpi_processor.c:585
 acpi_ns_walk_namespace+0x26b/0x690 drivers/acpi/acpica/nswalk.c:-1
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888020afd300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888020afd380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888020afd400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888020afd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888020afd500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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