hfsplus: invalid length 256 has been corrected to 255
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x5b9/0x1240 fs/hfsplus/unicode.c:186
Read of size 2 at addr ffff888018a53218 by task syz.0.1437/11350

CPU: 0 PID: 11350 Comm: syz.0.1437 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 hfsplus_uni2asc+0x5b9/0x1240 fs/hfsplus/unicode.c:186
 hfsplus_listxattr+0x58b/0xb80 fs/hfsplus/xattr.c:740
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x283/0x2e0 fs/xattr.c:804
 path_listxattr+0xd9/0x1b0 fs/xattr.c:828
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f342138efc9
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:00007f3422152038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3
RAX: ffffffffffffffda RBX: 00007f34215e6090 RCX: 00007f342138efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f3421411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f34215e6128 R14: 00007f34215e6090 R15: 00007ffe27058a08
 </TASK>

Allocated by task 11350:
 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+0x8e/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xb0/0x240 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
 hfsplus_listxattr+0x38c/0xb80 fs/hfsplus/xattr.c:700
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x283/0x2e0 fs/xattr.c:804
 path_listxattr+0xd9/0x1b0 fs/xattr.c:828
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
 kvfree_call_rcu+0x108/0x870 kernel/rcu/tree.c:3405
 neigh_flush_dev+0x177/0xa80 net/core/neighbour.c:430
 __neigh_ifdown+0x3d/0x460 net/core/neighbour.c:447
 neigh_ifdown+0x1b/0x30 net/core/neighbour.c:465
 rt6_disable_ip+0x78e/0x7f0 net/ipv6/route.c:4951
 addrconf_ifdown+0x162/0x1a10 net/ipv6/addrconf.c:3798
 addrconf_notify+0x405/0xf40 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 dev_close_many+0x28d/0x400 net/core/dev.c:1601
 dev_close+0x14c/0x200 net/core/dev.c:1623
 cfg80211_shutdown_all_interfaces+0xb7/0x1c0 net/wireless/core.c:275
 ieee80211_remove_interfaces+0x167/0x6d0 net/mac80211/iface.c:2364
 ieee80211_unregister_hw+0x59/0x290 net/mac80211/main.c:1483
 mac80211_hwsim_del_radio+0x270/0x450 drivers/net/wireless/mac80211_hwsim.c:4688
 hwsim_exit_net+0x581/0x640 drivers/net/wireless/mac80211_hwsim.c:5475
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x6f0/0xb80 net/core/net_namespace.c:640
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Second to last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
 kvfree_call_rcu+0x108/0x870 kernel/rcu/tree.c:3405
 neigh_flush_dev+0x177/0xa80 net/core/neighbour.c:430
 __neigh_ifdown+0x3d/0x460 net/core/neighbour.c:447
 neigh_ifdown+0x1b/0x30 net/core/neighbour.c:465
 rt6_disable_ip+0x78e/0x7f0 net/ipv6/route.c:4951
 addrconf_ifdown+0x162/0x1a10 net/ipv6/addrconf.c:3798
 addrconf_notify+0x405/0xf40 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 dev_close_many+0x28d/0x400 net/core/dev.c:1601
 unregister_netdevice_many+0x471/0x1840 net/core/dev.c:10964
 ip_tunnel_delete_nets+0x318/0x360 net/ipv4/ip_tunnel.c:1171
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888018a53000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 536 bytes inside of
 1024-byte region [ffff888018a53000, ffff888018a53400)

The buggy address belongs to the physical page:
page:ffffea0000629400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18a50
head:ffffea0000629400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888017441dc0
raw: 0000000000000000 0000000000100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 2058590307, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115
 alloc_slab_page+0x5d/0x160 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1997
 ___slab_alloc+0xbc6/0x1230 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 bus_register+0x54/0x6c0 drivers/base/bus.c:791
 subsys_register+0x20/0x1c0 drivers/base/bus.c:1089
 node_dev_init+0x76/0x2ef drivers/base/node.c:960
 driver_init+0x48/0x4d drivers/base/init.c:40
 do_basic_setup+0x14/0x7f init/main.c:1415
 kernel_init_freeable+0x3fa/0x5ac init/main.c:1638
 kernel_init+0x19/0x1b0 init/main.c:1526
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888018a53100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888018a53180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888018a53200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888018a53280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888018a53300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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