audit: type=1400 audit(1584547305.820:36): avc:  denied  { map } for  pid=7472 comm="syz-executor195" path="/root/syz-executor195313127" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: slab-out-of-bounds in tcindex_set_parms+0x1521/0x16a0 net/sched/cls_tcindex.c:473
Write of size 16 at addr ffff8880a935d470 by task syz-executor195/7473

CPU: 0 PID: 7473 Comm: syz-executor195 Not tainted 4.14.173-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+0x13e/0x194 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393
 tcindex_set_parms+0x1521/0x16a0 net/sched/cls_tcindex.c:473
 tcindex_change+0x1b5/0x270 net/sched/cls_tcindex.c:534
 tc_ctl_tfilter+0xf13/0x18e6 net/sched/cls_api.c:738
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xc5/0x100 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x440e79
RSP: 002b:00007fff1171bcb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004a2650 RCX: 0000000000440e79
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007fff1171bcc0 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004a2650
R13: 0000000000402410 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 7473:
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
 kmem_cache_alloc_trace+0x14d/0x7b0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 sock_alloc_inode+0x5f/0x250 net/socket.c:254
 alloc_inode+0x5d/0x170 fs/inode.c:209
 new_inode_pseudo+0x14/0xe0 fs/inode.c:898
 sock_alloc+0x3c/0x270 net/socket.c:569
 __sock_create+0x89/0x620 net/socket.c:1239
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd2/0x170 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 400:
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcb/0x260 mm/slab.c:3815
 call_usermodehelper_freeinfo kernel/umh.c:43 [inline]
 umh_complete kernel/umh.c:57 [inline]
 umh_complete+0x6d/0x80 kernel/umh.c:46
 call_usermodehelper_exec_async+0x413/0x4c0 kernel/umh.c:110
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

The buggy address belongs to the object at ffff8880a935d3c0
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 48 bytes to the right of
 128-byte region [ffff8880a935d3c0, ffff8880a935d440)
The buggy address belongs to the page:
page:ffffea0002a4d740 count:1 mapcount:0 mapping:ffff8880a935d000 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff8880a935d000 0000000000000000 0000000100000015
raw: ffffea0002a4d360 ffffea0002a4daa0 ffff88812fe56640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a935d300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
 ffff8880a935d380: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
>ffff8880a935d400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                                             ^
 ffff8880a935d480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a935d500: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================