syzbot

==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x57f/0x1200 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff88814d35f40c by task syz-executor319/5830

CPU: 0 UID: 0 PID: 5830 Comm: syz-executor319 Not tainted 6.12.0-rc7-syzkaller-00070-g0a9b9d17f3a7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 hfsplus_uni2asc+0x57f/0x1200 fs/hfsplus/unicode.c:179
 hfsplus_readdir+0x938/0x1320 fs/hfsplus/dir.c:207
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7741792e63
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 92 48 fb ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8
RSP: 002b:00007ffce4ac00a8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00005555641f7730 RCX: 00007f7741792e63
RDX: 0000000000008000 RSI: 00005555641f7730 RDI: 0000000000000004
RBP: 00005555641f7704 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000000000000010 R14: 00005555641f7700 R15: 431bde82d7b634db
 </TASK>

Allocated by task 5830:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x20b/0x1320 fs/hfsplus/dir.c:144
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88814d35f000
 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 [ffff88814d35f000, ffff88814d35f40c)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14d358
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801ac42000 ffffea000534a000 dead000000000002
raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 057ff00000000040 ffff88801ac42000 ffffea000534a000 dead000000000002
head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000
head: 057ff00000000003 ffffea000534d601 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
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 11859617419, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x363e/0x3790 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4750
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2412
 allocate_slab+0x5a/0x2f0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 snd_ctl_led_sysfs_add sound/core/control_led.c:656 [inline]
 snd_ctl_led_register+0x354/0x8c0 sound/core/control_led.c:347
 snd_ctl_dev_register+0xcb/0x140 sound/core/control.c:2300
 __snd_device_register sound/core/device.c:149 [inline]
 snd_device_register_all+0xc9/0x1a0 sound/core/device.c:197
 snd_card_register+0x1d9/0x6e0 sound/core/init.c:895
 snd_virmidi_probe+0x4ee/0x7a0 sound/drivers/virmidi.c:105
 platform_probe+0x13a/0x1c0 drivers/base/platform.c:1404
 really_probe+0x2b8/0xad0 drivers/base/dd.c:658
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88814d35f300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88814d35f380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88814d35f400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88814d35f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88814d35f500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================