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
Read of size 1 at addr ffff8881a7fb48a6 by task syz.3.258/8155

CPU: 0 UID: 0 PID: 8155 Comm: syz.3.258 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 strcmp+0x6b/0xc0
 hpfs_get_ea+0x134/0xee0
 hpfs_read_inode+0x1a6/0x1050
 hpfs_fill_super+0x123d/0x1fa0
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b28f9e04a
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:00007f8b29defe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8b29defee0 RCX: 00007f8b28f9e04a
RDX: 0000200000000100 RSI: 0000200000000040 RDI: 00007f8b29defea0
RBP: 0000200000000100 R08: 00007f8b29defee0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f8b29defea0 R14: 0000000000009e15 R15: 0000200000000080
 </TASK>

The buggy address belongs to the object at ffff8881a7fb4888
 which belongs to the cache fasync_cache of size 104
The buggy address is located 30 bytes inside of
 allocated 104-byte region [ffff8881a7fb4888, ffff8881a7fb48f0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a7fb4
memcg:ffff88816feb6601
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000000 ffff888101b00c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000800180018 00000000f5000000 ffff88816feb6601
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 8100, tgid 8099 (syz.0.254), ts 164450774922, free_ts 159821444203
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x339/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 kmem_cache_alloc_noprof+0x37d/0x650
 do_fcntl_add_lease+0x320/0x470
 fcntl_setlease+0x123/0x180
 do_fcntl+0x8b3/0x1a20
 __se_sys_fcntl+0xc8/0x150
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7447 tgid 7447 stack trace:
 __free_frozen_pages+0xbc7/0xd30
 vfree+0x1d1/0x2f0
 kcov_close+0x28/0x50
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 do_exit+0x70f/0x22c0
 do_group_exit+0x21b/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x221a/0x2240
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881a7fb4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a7fb4800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881a7fb4880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8881a7fb4900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a7fb4980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
