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BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x57f/0x1200 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff88801e57c40c by task syz-executor.1/5221

CPU: 1 PID: 5221 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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+0x93b/0x1320 fs/hfsplus/dir.c:207
 iterate_dir+0x53b/0x6f0 fs/readdir.c:110
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:311
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f567c47de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f567d1900c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f567c5abf80 RCX: 00007f567c47de69
RDX: 0000000000000090 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007f567c4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f567c5abf80 R15: 00007ffca31f11d8
 </TASK>

Allocated by task 5221:
 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:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3966 [inline]
 __kmalloc+0x233/0x4a0 mm/slub.c:3979
 kmalloc include/linux/slab.h:632 [inline]
 hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x20e/0x1320 fs/hfsplus/dir.c:144
 iterate_dir+0x53b/0x6f0 fs/readdir.c:110
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:311
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

The buggy address belongs to the object at ffff88801e57c000
 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 [ffff88801e57c000, ffff88801e57c40c)

The buggy address belongs to the physical page:
page:ffffea0000795e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e578
head:ffffea0000795e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888014c42000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080080008 00000001ffffffff 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 0x152800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5221, tgid 5220 (syz-executor.1), ts 82631821695, free_ts 82615231911
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2175
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2391
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmalloc_node_trace+0x264/0x3a0 mm/slub.c:4005
 kmalloc_node include/linux/slab.h:644 [inline]
 kzalloc_node include/linux/slab.h:760 [inline]
 throtl_pd_alloc+0xa0/0x600 block/blk-throttle.c:344
 blkg_alloc+0x524/0x7f0 block/blk-cgroup.c:346
 blkg_create+0x46b/0x1530 block/blk-cgroup.c:397
 blkg_lookup_create block/blk-cgroup.c:514 [inline]
 blkg_tryget_closest block/blk-cgroup.c:2012 [inline]
 bio_associate_blkg_from_css+0x9d1/0xc70 block/blk-cgroup.c:2046
 bio_associate_blkg+0x170/0x230 block/blk-cgroup.c:2077
 bio_init block/bio.c:265 [inline]
 bio_alloc_bioset+0x4cf/0x1130 block/bio.c:569
 bio_alloc include/linux/bio.h:437 [inline]
 hfsplus_submit_bio+0xf7/0x260 fs/hfsplus/wrapper.c:68
 hfsplus_read_wrapper+0x6ae/0x1340 fs/hfsplus/wrapper.c:187
 hfsplus_fill_super+0x38e/0x1ca0 fs/hfsplus/super.c:419
page last free pid 4522 tgid 4522 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
 __slab_free+0x31b/0x3d0 mm/slub.c:4192
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc_node+0x202/0x4e0 mm/slub.c:3973
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0x72/0x190 mm/util.c:634
 kvmalloc include/linux/slab.h:766 [inline]
 seq_buf_alloc fs/seq_file.c:38 [inline]
 seq_read_iter+0x202/0xd60 fs/seq_file.c:210
 call_read_iter include/linux/fs.h:2102 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x97d/0xb70 fs/read_write.c:476
 ksys_read+0x1a0/0x2c0 fs/read_write.c:619
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Memory state around the buggy address:
 ffff88801e57c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801e57c380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801e57c400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88801e57c480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801e57c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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