==================================================================
BUG: KASAN: slab-out-of-bounds in __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68
Read of size 4 at addr ffff8801d0a7eb38 by task syz-executor.0/10330

CPU: 0 PID: 10330 Comm: syz-executor.0 Not tainted 4.4.174+ #4
 0000000000000000 f7c07c75dc91306e ffff8801d0b1eda0 ffffffff81aad1a1
 0000000000000000 ffffea0007429f00 ffff8801d0a7eb38 0000000000000004
 ffff8801d0a7e880 ffff8801d0b1edd8 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 10330:
 [<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 8901:
 [<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
 [<ffffffff821fd036>] skb_free_head net/core/skbuff.c:571 [inline]
 [<ffffffff821fd036>] skb_release_data+0x2e6/0x380 net/core/skbuff.c:602
 [<ffffffff821fd11d>] skb_release_all+0x4d/0x60 net/core/skbuff.c:661
 [<ffffffff821fd146>] __kfree_skb+0x16/0x30 net/core/skbuff.c:675
 [<ffffffff82415fb3>] tcp_data_queue+0x1d43/0x3a90 net/ipv4/tcp_input.c:4605
 [<ffffffff82422a99>] tcp_rcv_established+0x599/0x2070 net/ipv4/tcp_input.c:5538
 [<ffffffff8264b3f4>] tcp_v6_do_rcv+0xdb4/0x11d0 net/ipv6/tcp_ipv6.c:1267
 [<ffffffff821e5e40>] sk_backlog_rcv include/net/sock.h:875 [inline]
 [<ffffffff821e5e40>] __release_sock net/core/sock.c:2024 [inline]
 [<ffffffff821e5e40>] release_sock+0x170/0x500 net/core/sock.c:2477
 [<ffffffff82210487>] sk_stream_wait_memory+0x4d7/0xcc0 net/core/stream.c:148
 [<ffffffff823fbea7>] tcp_sendmsg+0x1177/0x2ab0 net/ipv4/tcp.c:1284
 [<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
 [<ffffffff821d8615>] sock_write_iter+0x235/0x3d0 net/socket.c:847
 [<ffffffff81496ae8>] new_sync_write fs/read_write.c:480 [inline]
 [<ffffffff81496ae8>] __vfs_write+0x2e8/0x3d0 fs/read_write.c:493
 [<ffffffff81498612>] vfs_write+0x182/0x4e0 fs/read_write.c:540
 [<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

The buggy address belongs to the object at ffff8801d0a7e880
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 696 bytes inside of
 1024-byte region [ffff8801d0a7e880, ffff8801d0a7ec80)
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: 2139 Comm: syz-executor.4 Not tainted 4.4.174+ #4
task: ffff8800b6498000 task.stack: ffff8800b2df8000
RIP: 0010:[<ffffffff819529c2>]  [<ffffffff819529c2>] __hlist_del include/linux/list.h:634 [inline]
RIP: 0010:[<ffffffff819529c2>]  [<ffffffff819529c2>] hlist_del_rcu include/linux/rculist.h:340 [inline]
RIP: 0010:[<ffffffff819529c2>]  [<ffffffff819529c2>] avc_node_delete+0x92/0x100 security/selinux/avc.c:493
RSP: 0018:ffff8800b2dffad0  EFLAGS: 00010003
RAX: dffffc0000000000 RBX: ffffffff82891bb8 RCX: ffffffff81952a10
RDX: 09ebe8eaa84be9ab RSI: ffffffff819529ac RDI: 4f5f4755425f4d5e
RBP: ffff8800b2dffae8 R08: ffff8801db71f4d8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 4f5f4755425f4d56
R13: ffff8801d0a7ec80 R14: 00000000000000ac R15: 0000000000000002
FS:  0000000000b31940(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe425a5e000 CR3: 00000000a797f000 CR4: 00000000001606b0
Stack:
 ffffffff82891bb8 ffffffff8404ea68 0000000000000202 ffff8800b2dffb30
 ffffffff819535d0 ffffffff81953532 ffff8801d0a25750 00000000000000cf
 0000000000000296 ffff8800b2dffc48 ffff8800b2dffc08 00000000000000cf
Call Trace:
 [<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
 [<ffffffff8195fd1d>] sock_has_perm+0x29d/0x400 security/selinux/hooks.c:4066
 [<ffffffff8195ff5f>] selinux_socket_getsockopt+0x3f/0x50 security/selinux/hooks.c:4346
 [<ffffffff81951643>] security_socket_getsockopt+0x83/0xc0 security/security.c:1259
 [<ffffffff821dcd0a>] SYSC_getsockopt net/socket.c:1801 [inline]
 [<ffffffff821dcd0a>] SyS_getsockopt+0xca/0x220 net/socket.c:1793
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 03 80 3c 02 00 75 6a 4d 85 e4 4d 89 65 00 74 26 e8 44 6c 9b ff 49 8d 7c 24 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 54 4d 89 6c 24 08 e8 1e 6c 9b ff 48 8d 7b 38 48 
RIP  [<ffffffff819529c2>] __hlist_del include/linux/list.h:634 [inline]
RIP  [<ffffffff819529c2>] hlist_del_rcu include/linux/rculist.h:340 [inline]
RIP  [<ffffffff819529c2>] avc_node_delete+0x92/0x100 security/selinux/avc.c:493
 RSP <ffff8800b2dffad0>
---[ end trace ba7dc7ab3675f0d6 ]---