==================================================================
BUG: KASAN: slab-out-of-bounds in __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68
Read of size 4 at addr ffff8800b3b7d038 by task syz-executor.3/5967

CPU: 0 PID: 5967 Comm: syz-executor.3 Not tainted 4.4.174+ #4
 0000000000000000 f72334a7f36cb979 ffff8800a2ad6da0 ffffffff81aad1a1
 0000000000000000 ffffea0002cedf00 ffff8800b3b7d038 0000000000000004
 ffff8800b3b7cd80 ffff8800a2ad6dd8 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
binder: BINDER_SET_CONTEXT_MGR already set
binder: 5969:5972 ioctl 40046207 0 returned -16
 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229
binder: 5969:5972 ioctl c0306201 20000040 returned -14
 [<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
audit_printk_skb: 12 callbacks suppressed
audit: type=1400 audit(1556050558.552:79): avc:  denied  { create } for  pid=5973 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
audit: type=1400 audit(1556050558.552:80): avc:  denied  { write } for  pid=5973 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
 [<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 5967:
 [<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 2144:
 [<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 ffff8800b3b7cd80
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 696 bytes inside of
 1024-byte region [ffff8800b3b7cd80, ffff8800b3b7d180)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2095 Comm: syz-fuzzer Not tainted 4.4.174+ #4
task: ffff8800b691c740 task.stack: ffff8800b6690000
RIP: 0010:[<ffffffff81b0c22e>]  [<ffffffff81b0c22e>] lookup_object lib/debugobjects.c:120 [inline]
RIP: 0010:[<ffffffff81b0c22e>]  [<ffffffff81b0c22e>] debug_object_activate+0x19e/0x470 lib/debugobjects.c:408
RSP: 0018:ffff8800b6697930  EFLAGS: 00010803
RAX: 1ffffffff0285582 RBX: 0000000000000003 RCX: ffffffff82ea7280
RDX: 14541d1cf1298164 RSI: 0000000000000001 RDI: a2a0e8e7894c0b27
RBP: ffff8800b6697a20 R08: ffffffff841552c8 R09: 0000000000000092
R10: ffffffff83a350f0 R11: 0000000000000000 R12: a2a0e8e7894c0b0f
R13: ffff8800b2127b30 R14: dffffc0000000000 R15: 1ffff10016cd2f2a
FS:  000000c4200863e8(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b6d5bc000 CR3: 00000001d73e6000 CR4: 00000000001606b0
Stack:
 ffff8800b691d008 1ffff10016cd2f2a ffffffff82ea7280 ffffffff841552c8
 0000000041b58ab3 ffffffff82c76911 ffffffff81b0c090 ffff8800b68979c0
 ffff8800b7fee398 0000000000000003 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff812446c5>] debug_rcu_head_queue kernel/rcu/rcu.h:75 [inline]
 [<ffffffff812446c5>] __call_rcu.constprop.0+0x35/0x930 kernel/rcu/tree.c:3059
 [<ffffffff81244fd2>] call_rcu+0x12/0x20 kernel/rcu/tree_plugin.h:662
 [<ffffffff819529f0>] avc_node_delete+0xc0/0x100 security/selinux/avc.c:494
 [<ffffffff819535d0>] avc_reclaim_node security/selinux/avc.c:531 [inline]
 [<ffffffff819535d0>] avc_alloc_node security/selinux/avc.c:559 [inline]
 [<ffffffff819535d0>] avc_alloc_node+0x290/0x3c0 security/selinux/avc.c:547
 [<ffffffff81954992>] avc_insert security/selinux/avc.c:670 [inline]
 [<ffffffff81954992>] avc_compute_av+0x182/0x610 security/selinux/avc.c:976
 [<ffffffff819566e5>] avc_has_perm_noaudit security/selinux/avc.c:1112 [inline]
 [<ffffffff819566e5>] avc_has_perm+0x355/0x3a0 security/selinux/avc.c:1146
 [<ffffffff81959e6c>] inode_has_perm security/selinux/hooks.c:1614 [inline]
 [<ffffffff81959e6c>] file_has_perm+0x2bc/0x460 security/selinux/hooks.c:1692
 [<ffffffff81965e3d>] selinux_revalidate_file_permission security/selinux/hooks.c:3192 [inline]
 [<ffffffff81965e3d>] selinux_file_permission+0x2ed/0x450 security/selinux/hooks.c:3212
 [<ffffffff8194e1d5>] security_file_permission+0x85/0x1e0 security/security.c:734
 [<ffffffff81497f21>] rw_verify_area+0xe1/0x2f0 fs/read_write.c:406
 [<ffffffff81498592>] vfs_write+0x102/0x4e0 fs/read_write.c:536
 [<ffffffff8149ac4c>] SYSC_write fs/read_write.c:587 [inline]
 [<ffffffff8149ac4c>] SyS_write+0xdc/0x1c0 fs/read_write.c:579
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 48 c1 e8 03 42 80 3c 30 00 0f 85 44 02 00 00 4d 8b 24 24 4d 85 e4 0f 84 b5 00 00 00 49 8d 7c 24 18 83 c3 01 48 89 fa 48 c1 ea 03 <42> 80 3c 32 00 0f 85 f5 01 00 00 4d 3b 6c 24 18 75 c0 4d 8d 74 
RIP  [<ffffffff81b0c22e>] lookup_object lib/debugobjects.c:120 [inline]
RIP  [<ffffffff81b0c22e>] debug_object_activate+0x19e/0x470 lib/debugobjects.c:408
 RSP <ffff8800b6697930>
---[ end trace 0849dbf05f2e465c ]---