==================================================================
BUG: KASAN: slab-out-of-bounds in __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68
Read of size 4 at addr ffff8801da4d0bb8 by task syz-executor.3/26292

CPU: 1 PID: 26292 Comm: syz-executor.3 Not tainted 4.4.174+ #4
 0000000000000000 febce124ed17d4f0 ffff88008fbaeda0 ffffffff81aad1a1
 0000000000000000 ffffea0007693400 ffff8801da4d0bb8 0000000000000004
 ffff8801da4d0900 ffff88008fbaedd8 ffffffff81490120 0000000000000000
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81490120>] print_address_description+0x6f/0x21b mm/kasan/report.c:252
 [<ffffffff81490358>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81490358>] kasan_report mm/kasan/report.c:408 [inline]
 [<ffffffff81490358>] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393
 [<ffffffff81484eb4>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:428
 [<ffffffff826bbd4c>] __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68
 [<ffffffff826b141c>] ipv6_addr_type include/net/ipv6.h:330 [inline]
 [<ffffffff826b141c>] ip6_tnl_xmit2+0x2ac/0x2320 net/ipv6/ip6_tunnel.c:988
 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline]
 [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212
 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline]
 [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline]
 [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline]
 [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369
 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213
 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288
 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362
 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119
 [<ffffffff823d300e>] ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1453
 [<ffffffff82478ded>] udp_send_skb+0x4fd/0xc70 net/ipv4/udp.c:842
 [<ffffffff8247fb9f>] udp_sendmsg+0x16cf/0x1c60 net/ipv4/udp.c:1072
 [<ffffffff826137a2>] udpv6_sendmsg+0x12f2/0x24f0 net/ipv6/udp.c:1173
 [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648
 [<ffffffff821da269>] ___sys_sendmsg+0x769/0x890 net/socket.c:1975
 [<ffffffff821dd0c5>] __sys_sendmsg+0xc5/0x160 net/socket.c:2009
 [<ffffffff821dd18d>] SYSC_sendmsg net/socket.c:2020 [inline]
 [<ffffffff821dd18d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Allocated by task 26292:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81483f22>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81483f22>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81483f22>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
 [<ffffffff81484197>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
 [<ffffffff81480521>] __kmalloc+0x141/0x330 mm/slub.c:3613
 [<ffffffff82264216>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82264216>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82264216>] neigh_alloc net/core/neighbour.c:285 [inline]
 [<ffffffff82264216>] __neigh_create+0x1d6/0x1b30 net/core/neighbour.c:457
 [<ffffffff823a024e>] neigh_create include/net/neighbour.h:313 [inline]
 [<ffffffff823a024e>] ipv4_neigh_lookup+0x52e/0x6e0 net/ipv4/route.c:464
 [<ffffffff826b13eb>] dst_neigh_lookup include/net/dst.h:466 [inline]
 [<ffffffff826b13eb>] ip6_tnl_xmit2+0x27b/0x2320 net/ipv6/ip6_tunnel.c:982
 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline]
 [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212
 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline]
 [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline]
 [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline]
 [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369
 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213
 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288
 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362
 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119
 [<ffffffff823d300e>] ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1453
 [<ffffffff82478ded>] udp_send_skb+0x4fd/0xc70 net/ipv4/udp.c:842
 [<ffffffff8247fb9f>] udp_sendmsg+0x16cf/0x1c60 net/ipv4/udp.c:1072
 [<ffffffff826137a2>] udpv6_sendmsg+0x12f2/0x24f0 net/ipv6/udp.c:1173
 [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648
 [<ffffffff821da269>] ___sys_sendmsg+0x769/0x890 net/socket.c:1975
 [<ffffffff821dd0c5>] __sys_sendmsg+0xc5/0x160 net/socket.c:2009
 [<ffffffff821dd18d>] SYSC_sendmsg net/socket.c:2020 [inline]
 [<ffffffff821dd18d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Freed by task 2135:
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81484820>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81484820>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81484820>] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589
 [<ffffffff81481c44>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff81481c44>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff81481c44>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff81481c44>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff81409a1d>] kvfree+0x4d/0x60 mm/util.c:323
 [<ffffffff8236dfdb>] xt_free_table_info+0x14b/0x1b0 net/netfilter/x_tables.c:1019
 [<ffffffff82687e03>] __do_replace+0x413/0x650 net/ipv6/netfilter/ip6_tables.c:1260
 [<ffffffff8268db91>] do_replace net/ipv6/netfilter/ip6_tables.c:1316 [inline]
 [<ffffffff8268db91>] do_ip6t_set_ctl+0x2e1/0x450 net/ipv6/netfilter/ip6_tables.c:1863
 [<ffffffff822fcfad>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline]
 [<ffffffff822fcfad>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114
 [<ffffffff826003eb>] ipv6_setsockopt net/ipv6/ipv6_sockglue.c:909 [inline]
 [<ffffffff826003eb>] ipv6_setsockopt+0x10b/0x140 net/ipv6/ipv6_sockglue.c:893
 [<ffffffff823f782a>] tcp_setsockopt net/ipv4/tcp.c:2643 [inline]
 [<ffffffff823f782a>] tcp_setsockopt+0x8a/0xe0 net/ipv4/tcp.c:2637
 [<ffffffff821def2a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2663
 [<ffffffff821dcb59>] SYSC_setsockopt net/socket.c:1780 [inline]
 [<ffffffff821dcb59>] SyS_setsockopt+0x159/0x240 net/socket.c:1759
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

The buggy address belongs to the object at ffff8801da4d0900
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 696 bytes inside of
 1024-byte region [ffff8801da4d0900, ffff8801da4d0d00)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffbfff7cc7d88
IP: [<ffffffff811f4715>] cpuacct_charge+0x145/0x360 kernel/sched/cpuacct.c:247
PGD 21ff68067 PUD 21ff67067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 2141 Comm: syz-executor.5 Not tainted 4.4.174+ #4
task: ffff8801d5d70000 task.stack: ffff8801c2350000
RIP: 0010:[<ffffffff811f4715>]  [<ffffffff811f4715>] cpuacct_charge+0x145/0x360 kernel/sched/cpuacct.c:247
RSP: 0018:ffff8801c2357898  EFLAGS: 00010046
RAX: 1ffffffff05d2a33 RBX: 00000000000181a8 RCX: ffffffffbe63ec40
RDX: fffffbfff7cc7d88 RSI: ffffffff81b0abec RDI: ffffffff82e95198
RBP: ffff8801c23578d8 R08: 0000000000000005 R09: ffff8801d5d709b0
R10: ffffffff82836880 R11: 0000000000000000 R12: ffffffff82e950c0
R13: dffffc0000000000 R14: 0000000005bb3b95 R15: 0000000007693400
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff7cc7d88 CR3: 00000000a8a13000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff811f4630 0000000000000046 0000000000000003 ffff8800b8a10060
 ffff8800b8a10000 0000000005bb3b95 ffff8800b8a100b0 0000000000000000
 ffff8801c2357920 ffffffff8117c4a3 ffffffff83a7f5d0 ffff8801d5d708c8
Call Trace:
 [<ffffffff8117c4a3>] update_curr+0x2c3/0x6e0 kernel/sched/fair.c:882
 [<ffffffff8119dedf>] enqueue_entity kernel/sched/fair.c:3512 [inline]
 [<ffffffff8119dedf>] enqueue_task_fair+0x10f/0xb6c0 kernel/sched/fair.c:4711
 [<ffffffff811638e4>] enqueue_task kernel/sched/core.c:858 [inline]
 [<ffffffff811638e4>] activate_task+0x154/0x280 kernel/sched/core.c:874
 [<ffffffff81164b5e>] ttwu_activate kernel/sched/core.c:1736 [inline]
 [<ffffffff81164b5e>] ttwu_do_activate.constprop.0+0xbe/0x1e0 kernel/sched/core.c:1789
 [<ffffffff81168041>] ttwu_queue kernel/sched/core.c:1934 [inline]
 [<ffffffff81168041>] try_to_wake_up+0x6d1/0x1110 kernel/sched/core.c:2068
 [<ffffffff8116ab00>] wake_up_state+0x10/0x20 kernel/sched/core.c:2148
 [<ffffffff810f8764>] signal_wake_up_state+0x44/0x70 kernel/signal.c:659
 [<ffffffff810f9ce2>] signal_wake_up include/linux/sched.h:3337 [inline]
 [<ffffffff810f9ce2>] complete_signal+0x632/0x7b0 kernel/signal.c:942
 [<ffffffff810fa3f7>] __send_signal+0x597/0x12a0 kernel/signal.c:1080
 [<ffffffff810fb149>] send_signal+0x49/0xc0 kernel/signal.c:1096
 [<ffffffff810fde34>] do_send_sig_info+0xa4/0x130 kernel/signal.c:1151
 [<ffffffff810fdef6>] send_sig_info+0x36/0x60 kernel/signal.c:1436
 [<ffffffff812db00b>] zap_pid_ns_processes+0x1cb/0x640 kernel/pid_namespace.c:223
 [<ffffffff810da5af>] find_child_reaper kernel/exit.c:485 [inline]
 [<ffffffff810da5af>] forget_original_parent kernel/exit.c:571 [inline]
 [<ffffffff810da5af>] exit_notify kernel/exit.c:607 [inline]
 [<ffffffff810da5af>] do_exit+0x236f/0x2c60 kernel/exit.c:784
 [<ffffffff810df091>] do_group_exit+0x111/0x300 kernel/exit.c:893
 [<ffffffff810df29d>] SYSC_exit_group kernel/exit.c:904 [inline]
 [<ffffffff810df29d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:902
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 89 ca 48 c1 ea 03 4c 01 ea 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 ba 01 00 00 49 8b 9c 24 d8 00 00 00 <80> 3a 00 0f 85 8c 01 00 00 4a 03 1c fd 40 4c 1a 83 48 89 d8 48 
RIP  [<ffffffff811f4715>] cpuacct_charge+0x145/0x360 kernel/sched/cpuacct.c:247
 RSP <ffff8801c2357898>
CR2: fffffbfff7cc7d88
---[ end trace 7b85a158047d40b5 ]---