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: use-after-free in strcmp+0x6b/0xc0
Read of size 1 at addr ffff888023a7b8a6 by task syz.1.85/6162

CPU: 0 UID: 0 PID: 6162 Comm: syz.1.85 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+0x137/0xeb0
 hpfs_read_inode+0x1a9/0x1060
 hpfs_fill_super+0x1275/0x1fa0
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f774c19f28a
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:00007f774cfdee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f774cfdeee0 RCX: 00007f774c19f28a
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f774cfdeea0
RBP: 000020000000a000 R08: 00007f774cfdeee0 R09: 0000000003204441
R10: 0000000003204441 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007f774cfdeea0 R14: 0000000000009e15 R15: 0000200000000140
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23a7b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff888023a7b780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888023a7b800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888023a7b880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888023a7b900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888023a7b980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
