audit: type=1400 audit(1602499870.509:8): avc:  denied  { execmem } for  pid=6380 comm="syz-executor189" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
ntfs: (device loop0): is_boot_sector_ntfs(): Invalid end of sector marker.
==================================================================
BUG: KASAN: slab-out-of-bounds in ntfs_attr_find+0x8df/0xa10 fs/ntfs/attrib.c:613
Read of size 4 at addr ffff8880973ae913 by task syz-executor189/6380

CPU: 0 PID: 6380 Comm: syz-executor189 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load_n_noabort+0x6b/0x80 mm/kasan/report.c:440
 ntfs_attr_find+0x8df/0xa10 fs/ntfs/attrib.c:613
 ntfs_attr_lookup+0xeca/0x1f30 fs/ntfs/attrib.c:1203
 ntfs_read_inode_mount+0x6b4/0x1fb0 fs/ntfs/inode.c:1867
 ntfs_fill_super+0x9a6/0x7170 fs/ntfs/super.c:2871
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x446e1a
RSP: 002b:00007fff587ebf58 EFLAGS: 00000287 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff587ebfb0 RCX: 0000000000446e1a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff587ebf70
RBP: 00007fff587ebf70 R08: 00007fff587ebfb0 R09: 00007fff00000015
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000002
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Allocated by task 6382:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552
 getname_flags+0xc8/0x550 fs/namei.c:138
 user_path_at_empty+0x2a/0x50 fs/namei.c:2631
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xd1/0x180 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3070 [inline]
 SYSC_newlstat fs/stat.c:350 [inline]
 SyS_newlstat+0x83/0xe0 fs/stat.c:344
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 6382:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758
 putname+0xcd/0x110 fs/namei.c:259
 filename_lookup+0x37b/0x510 fs/namei.c:2386
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xd1/0x180 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3070 [inline]
 SYSC_newlstat fs/stat.c:350 [inline]
 SyS_newlstat+0x83/0xe0 fs/stat.c:344
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880973aed40
 which belongs to the cache names_cache of size 4096
The buggy address is located 1069 bytes to the left of
 4096-byte region [ffff8880973aed40, ffff8880973afd40)
The buggy address belongs to the page:
page:ffffea00025ceb80 count:1 mapcount:0 mapping:ffff8880973aed40 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff8880973aed40 0000000000000000 0000000100000001
raw: ffffea00025dd020 ffffea00025e94a0 ffff8880aa58ccc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880973ae800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880973ae880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880973ae900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff8880973ae980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880973aea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================