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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 ffff0000d0b0e40c by task syz-executor/6455

CPU: 0 UID: 0 PID: 6455 Comm: syz-executor Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x198/0x550 mm/kasan/report.c:521
 kasan_report+0xd8/0x138 mm/kasan/report.c:634
 __asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
 hfsplus_uni2asc+0x624/0x1018 fs/hfsplus/unicode.c:179
 hfsplus_readdir+0x7a0/0xf28 fs/hfsplus/dir.c:207
 iterate_dir+0x46c/0x5f4 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64 fs/readdir.c:389 [inline]
 __arm64_sys_getdents64+0x1c0/0x490 fs/readdir.c:389
 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Allocated by task 6455:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4294 [inline]
 __kmalloc_noprof+0x32c/0x54c mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x1c8/0xf28 fs/hfsplus/dir.c:144
 iterate_dir+0x46c/0x5f4 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64 fs/readdir.c:389 [inline]
 __arm64_sys_getdents64+0x1c0/0x490 fs/readdir.c:389
 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at ffff0000d0b0e000
 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 [ffff0000d0b0e000, ffff0000d0b0e40c)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110b08
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 fffffdffc3c81000 dead000000000002
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002000 fffffdffc3c81000 dead000000000002
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc342c201 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d0b0e300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d0b0e380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d0b0e400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff0000d0b0e480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d0b0e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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