dccp_invalid_packet: P.type (REQUEST) not Data || [Data]Ack, while P.X == 0
==================================================================
BUG: KASAN: slab-out-of-bounds in sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
Read of size 2 at addr ffff8801ccdec688 by task syz-executor5/8720

CPU: 1 PID: 8720 Comm: syz-executor5 Not tainted 4.15.0-rc2+ #126
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+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
 sctp_setsockopt_reset_streams net/sctp/socket.c:3905 [inline]
 sctp_setsockopt+0x70d/0x5d50 net/sctp/socket.c:4195
 compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
 C_SYSC_setsockopt net/compat.c:403 [inline]
 compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f05c79
RSP: 002b:00000000f76e008c EFLAGS: 00000296 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000000000084
RDX: 0000000000000077 RSI: 0000000020e73ff8 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8720:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3711 [inline]
 __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3726
 memdup_user+0x2c/0x90 mm/util.c:164
 sctp_setsockopt_reset_streams net/sctp/socket.c:3897 [inline]
 sctp_setsockopt+0x6a6/0x5d50 net/sctp/socket.c:4195
 compat_sock_common_setsockopt+0x104/0x140 net/core/sock.c:2981
 C_SYSC_setsockopt net/compat.c:403 [inline]
 compat_SyS_setsockopt+0x17c/0x410 net/compat.c:386
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125

Freed by task 3126:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3491 [inline]
 kfree+0xca/0x250 mm/slab.c:3806
 security_inode_init_security+0x1c3/0x390 security/security.c:494
 shmem_mknod+0x9b/0x1b0 mm/shmem.c:2995
 shmem_create+0x2b/0x40 mm/shmem.c:3050
 lookup_open+0x11d0/0x1900 fs/namei.c:3200
 do_last fs/namei.c:3291 [inline]
 path_openat+0xd7c/0x3530 fs/namei.c:3519
 do_filp_open+0x25b/0x3b0 fs/namei.c:3554
 do_sys_open+0x502/0x6d0 fs/open.c:1059
 SYSC_open fs/open.c:1077 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1072
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801ccdec680
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 32-byte region [ffff8801ccdec680, ffff8801ccdec6a0)
The buggy address belongs to the page:
page:000000009b48803c count:1 mapcount:0 mapping:00000000514a2cd7 index:0xffff8801ccdecfc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801ccdec000 ffff8801ccdecfc1 000000010000003e
raw: ffffea0007648b60 ffffea0007397320 ffff8801db0001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ccdec580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801ccdec600: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
>ffff8801ccdec680: 00 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
                      ^
 ffff8801ccdec700: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801ccdec780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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