hpfs: filesystem error: invalid number of hotfixes: 2066844986, used: 2066844985; already mounted read-only
hpfs: filesystem error: improperly stopped
hpfs: filesystem error: warning: spare dnodes used, try chkdsk
hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
==================================================================
BUG: KASAN: slab-out-of-bounds in strcmp+0x6b/0xc0 lib/string.c:265
Read of size 1 at addr ffff888061f4dd57 by task syz.7.185/7297

CPU: 1 UID: 0 PID: 7297 Comm: syz.7.185 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 strcmp+0x6b/0xc0 lib/string.c:265
 hpfs_get_ea+0x137/0xeb0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x1a9/0x1060 fs/hpfs/inode.c:63
 hpfs_fill_super+0x127b/0x1fb0 fs/hpfs/super.c:652
  245.041265][ T7297]
 get_tree_bdev_flags+0x436/0x500 fs/super.c:1821
 vfs_get_tree+0x92/0x2a0 fs/super.c:1881
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount+0x325/0xb00 fs/namespace.c:3986
 do_mount fs/namespace.c:4350 [inline]
 __do_sys_mount fs/namespace.c:4565 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4542
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9bc290d8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc9ba4e5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc9ba4e5ee0 RCX: 00007fc9bc290d8a
RDX: 0000200000000080 RSI: 0000200000000100 RDI: 00007fc9ba4e5ea0
RBP: 0000200000000080 R08: 00007fc9ba4e5ee0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000100
R13: 00007fc9ba4e5ea0 R14: 0000000000009e15 R15: 0000200000000640
 </TASK>

Allocated by task 5608:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5531 [inline]
 __kmalloc_node_track_caller_noprof+0x569/0x7b0 mm/slub.c:5662
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:713 [inline]
 mpls_dev_sysctl_register+0xc6/0x280 net/mpls/af_mpls.c:1438
 mpls_add_dev net/mpls/af_mpls.c:1506 [inline]
 mpls_dev_notify+0x3b7/0xd30 net/mpls/af_mpls.c:1651
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86
 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline]
 call_netdevice_notifiers net/core/dev.c:2365 [inline]
 register_netdevice+0x1c15/0x2290 net/core/dev.c:11758
 veth_newlink+0x4ef/0xde0 drivers/net/veth.c:1878
 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:4006
 __rtnl_newlink net/core/rtnetlink.c:4135 [inline]
 rtnl_newlink+0x167a/0x1c30 net/core/rtnetlink.c:4252
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7169
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x90c/0xac0 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x7f0/0xb20 net/netlink/af_netlink.c:1920
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 __sys_sendto+0x41e/0x5d0 net/socket.c:2283
 __do_sys_sendto net/socket.c:2290 [inline]
 __se_sys_sendto net/socket.c:2286 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2286
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888061f4dd00
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 31 bytes to the right of
 allocated 56-byte region [ffff888061f4dd00, ffff888061f4dd38)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x61f4d
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88813ff138c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5608, tgid 5608 (syz-executor), ts 96130971622
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x259a/0x2610 mm/page_alloc.c:3940
 __alloc_frozen_pages_noprof+0x227/0x440 mm/page_alloc.c:5464
 alloc_slab_page mm/slub.c:3384 [inline]
 allocate_slab+0x7d/0x5e0 mm/slub.c:3499
 new_slab mm/slub.c:3550 [inline]
 refill_objects+0x2d8/0x350 mm/slub.c:7539
 refill_sheaf mm/slub.c:2917 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811
 alloc_from_pcs mm/slub.c:4887 [inline]
 slab_alloc_node mm/slub.c:5021 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_node_track_caller_noprof+0x619/0x7b0 mm/slub.c:5662
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:713 [inline]
 mpls_dev_sysctl_register+0xc6/0x280 net/mpls/af_mpls.c:1438
 mpls_add_dev net/mpls/af_mpls.c:1506 [inline]
 mpls_dev_notify+0x3b7/0xd30 net/mpls/af_mpls.c:1651
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86
 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline]
 call_netdevice_notifiers net/core/dev.c:2365 [inline]
 register_netdevice+0x1c15/0x2290 net/core/dev.c:11758
 wg_newlink+0x39b/0x670 drivers/net/wireguard/device.c:372
 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:4006
 __rtnl_newlink net/core/rtnetlink.c:4135 [inline]
 rtnl_newlink+0x167a/0x1c30 net/core/rtnetlink.c:4252
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7169
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888061f4dc00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888061f4dc80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888061f4dd00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
                                                 ^
 ffff888061f4dd80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff888061f4de00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================