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BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x576/0x11f0 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff88807286940c by task syz.4.211/4428

CPU: 1 PID: 4428 Comm: syz.4.211 Not tainted 6.1.97-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 hfsplus_uni2asc+0x576/0x11f0 fs/hfsplus/unicode.c:179
 hfsplus_readdir+0x922/0x12c0 fs/hfsplus/dir.c:207
 iterate_dir+0x224/0x560
 __do_sys_getdents fs/readdir.c:286 [inline]
 __se_sys_getdents+0x1eb/0x4c0 fs/readdir.c:271
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f48dc575bd9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f48dd3ea048 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f48dc703f60 RCX: 00007f48dc575bd9
RDX: 00000000000000b8 RSI: 0000000020001fc0 RDI: 0000000000000004
RBP: 00007f48dc5e4aa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f48dc703f60 R15: 00007fffdbdf3198
 </TASK>

Allocated by task 4428:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0xb2/0x230 mm/slab_common.c:968
 kmalloc include/linux/slab.h:561 [inline]
 hfsplus_find_init+0x81/0x1c0 fs/hfsplus/bfind.c:21
 hfsplus_readdir+0x207/0x12c0 fs/hfsplus/dir.c:144
 iterate_dir+0x224/0x560
 __do_sys_getdents fs/readdir.c:286 [inline]
 __se_sys_getdents+0x1eb/0x4c0 fs/readdir.c:271
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2844
 netlink_release+0x1554/0x19e0 net/netlink/af_netlink.c:815
 __sock_release net/socket.c:654 [inline]
 sock_close+0xcd/0x230 net/socket.c:1400
 __fput+0x3b7/0x890 fs/file_table.c:320
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888072869000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1036 bytes inside of
 2048-byte region [ffff888072869000, ffff888072869800)

The buggy address belongs to the physical page:
page:ffffea0001ca1a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807286e000 pfn:0x72868
head:ffffea0001ca1a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00005dbe00 dead000000000002 ffff888012442000
raw: ffff88807286e000 0000000080080006 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3604, tgid 3604 (kworker/1:8), ts 71627507840, free_ts 68327865818
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517
 prep_new_page mm/page_alloc.c:2524 [inline]
 get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4283
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5551
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:975
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x135/0x670 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1271 [inline]
 alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6168
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2747
 sock_alloc_send_skb include/net/sock.h:1918 [inline]
 mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748
 add_grhead net/ipv6/mcast.c:1851 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989
 mld_send_initial_cr+0x20f/0x3a0 net/ipv6/mcast.c:2236
 mld_dad_work+0x40/0x400 net/ipv6/mcast.c:2262
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1444 [inline]
 free_pcp_prepare mm/page_alloc.c:1494 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3362
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3457
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
 __alloc_skb+0xde/0x670 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1271 [inline]
 alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6168
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2747
 sock_alloc_send_skb include/net/sock.h:1918 [inline]
 mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748
 add_grhead net/ipv6/mcast.c:1851 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989
 mld_send_cr net/ipv6/mcast.c:2115 [inline]
 mld_ifc_work+0x68f/0xc90 net/ipv6/mcast.c:2653
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376

Memory state around the buggy address:
 ffff888072869300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888072869380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888072869400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888072869480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888072869500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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