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BUG: KASAN: slab-out-of-bounds in ntfs_attr_find+0x9e9/0xb20 fs/ntfs/attrib.c:599
Read of size 4 at addr ffff88809e621fff by task syz-executor.1/16861

CPU: 1 PID: 16861 Comm: syz-executor.1 Not tainted 5.9.0-rc6-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+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 ntfs_attr_find+0x9e9/0xb20 fs/ntfs/attrib.c:599
 ntfs_attr_lookup+0x1051/0x2060 fs/ntfs/attrib.c:1189
 ntfs_read_inode_mount+0x730/0x22b0 fs/ntfs/inode.c:1833
 ntfs_fill_super+0xa63/0x8560 fs/ntfs/super.c:2857
 mount_bdev+0x32e/0x3f0 fs/super.c:1417
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x1387/0x20a0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount fs/namespace.c:3390 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460bca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 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 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f17e77faa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f17e77fab20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f17e77faae0
RBP: 00007f17e77faae0 R08: 00007f17e77fab20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020099000

Allocated by task 4881:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3316 [inline]
 kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3486
 shmem_alloc_inode+0x18/0x40 mm/shmem.c:3821
 alloc_inode+0x61/0x230 fs/inode.c:232
 new_inode_pseudo fs/inode.c:928 [inline]
 new_inode+0x27/0x2f0 fs/inode.c:957
 shmem_get_inode+0x195/0xc10 mm/shmem.c:2293
 shmem_mknod+0x5a/0x1f0 mm/shmem.c:2920
 lookup_open.isra.0+0xf85/0x1350 fs/namei.c:3103
 open_last_lookups fs/namei.c:3177 [inline]
 path_openat+0x96d/0x2730 fs/namei.c:3365
 do_filp_open+0x17e/0x3c0 fs/namei.c:3395
 do_sys_openat2+0x16d/0x420 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1188
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88809e621880
 which belongs to the cache shmem_inode_cache of size 1312
The buggy address is located 607 bytes to the right of
 1312-byte region [ffff88809e621880, ffff88809e621da0)
The buggy address belongs to the page:
page:00000000276ad95d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809e621ffb pfn:0x9e620
head:00000000276ad95d order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0002391588 ffffea0002773c08 ffff8880aa221a00
raw: ffff88809e621ffb ffff88809e620200 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809e621e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809e621f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809e621f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88809e622000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809e622080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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