audit: type=1400 audit(1584544978.913:36): avc:  denied  { map } for  pid=7340 comm="syz-executor874" path="/root/syz-executor874015636" 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: use-after-free in tcindex_set_parms+0x1521/0x16a0 net/sched/cls_tcindex.c:473
Write of size 16 at addr ffff88809ba21400 by task syz-executor874/7345

CPU: 1 PID: 7345 Comm: syz-executor874 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: 0033:0x4416f9
RSP: 002b:00007ffcd14bceb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004416f9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007ffcd14bcec0 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000100000000 R11: 0000000000000246 R12: 000000000000c075
R13: 0000000000402650 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1:
 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]
 kzalloc include/linux/slab.h:661 [inline]
 call_usermodehelper_setup+0x6f/0x2e0 kernel/umh.c:374
 kobject_uevent_env+0xa79/0xc50 lib/kobject_uevent.c:525
 device_add+0xa02/0x1400 drivers/base/core.c:1916
 device_create_groups_vargs+0x1dc/0x250 drivers/base/core.c:2513
 device_create_with_groups+0xd4/0x100 drivers/base/core.c:2632
 misc_register+0x3b1/0x5b0 drivers/char/misc.c:219
 init_binder_device drivers/android/binder.c:5561 [inline]
 binder_init+0x2bb/0x4e1 drivers/android/binder.c:5630
 do_one_initcall+0x88/0x202 init/main.c:824
 do_initcall_level init/main.c:890 [inline]
 do_initcalls init/main.c:898 [inline]
 do_basic_setup init/main.c:916 [inline]
 kernel_init_freeable+0x465/0x526 init/main.c:1073
 kernel_init+0xd/0x15b init/main.c:998
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 3318:
 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 ffff88809ba213c0
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 64 bytes inside of
 128-byte region [ffff88809ba213c0, ffff88809ba21440)
The buggy address belongs to the page:
page:ffffea00026e8840 count:1 mapcount:0 mapping:ffff88809ba21000 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff88809ba21000 0000000000000000 0000000100000015
raw: ffffea00026b6960 ffffea00026e8be0 ffff88812fe56640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809ba21300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
 ffff88809ba21380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88809ba21400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff88809ba21480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809ba21500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================