audit: type=1400 audit(1601205882.263:8): avc:  denied  { execmem } for  pid=6502 comm="syz-executor545" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
IPVS: ftp: loaded support on port[0] = 21
ntfs: (device loop0): is_boot_sector_ntfs(): Invalid end of sector marker.
==================================================================
BUG: KASAN: use-after-free in ntfs_attr_find+0xa42/0xb70 fs/ntfs/attrib.c:613
Read of size 4 at addr ffff8880a3e9607f by task syz-executor545/6503

CPU: 0 PID: 6503 Comm: syz-executor545 Not tainted 4.19.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 ntfs_attr_find+0xa42/0xb70 fs/ntfs/attrib.c:613
 ntfs_attr_lookup+0x1087/0x2060 fs/ntfs/attrib.c:1203
 ntfs_read_inode_mount+0x7e4/0x23b0 fs/ntfs/inode.c:1858
 ntfs_fill_super+0x1761/0x89d2 fs/ntfs/super.c:2871
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44a11a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 1d aa fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 fa a9 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffecff85cc8 EFLAGS: 00000287 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffecff85d20 RCX: 000000000044a11a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffecff85ce0
RBP: 0000000000000004 R08: 00007ffecff85d20 R09: 00007ffecff85d10
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000003
R13: 00007ffecff85ce0 R14: 0000000000000000 R15: 0000000020001fb0

Allocated by task 6482:
 kmem_cache_alloc+0x126/0x4a0 mm/slab.c:3559
 kmem_cache_zalloc include/linux/slab.h:699 [inline]
 __alloc_file+0x21/0x330 fs/file_table.c:100
 alloc_empty_file+0x6d/0x170 fs/file_table.c:150
 path_openat+0x12b/0x2e90 fs/namei.c:3526
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x2b0 mm/slab.c:3765
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x948/0x1d00 kernel/rcu/tree.c:2881
 __do_softirq+0x27d/0xad2 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a3e96000
 which belongs to the cache filp of size 456
The buggy address is located 127 bytes inside of
 456-byte region [ffff8880a3e96000, ffff8880a3e961c8)
The buggy address belongs to the page:
page:ffffea00028fa580 count:1 mapcount:0 mapping:ffff88812c291840 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00028df348 ffffea00028c96c8 ffff88812c291840
raw: 0000000000000000 ffff8880a3e96000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a3e95f00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a3e95f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a3e96000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff8880a3e96080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a3e96100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================