==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987
Read of size 16 at addr ffff8801bb3d02b0 by task syz-executor.4/2904

CPU: 0 PID: 2904 Comm: syz-executor.4 Not tainted 4.4.174+ #4
 0000000000000000 ad6cb87ba96214c0 ffff8801d456ee70 ffffffff81aad1a1
 0000000000000000 ffffea0006ecf400 ffff8801bb3d02b0 0000000000000010
 ffff8801bb3d0000 ffff8801d456eea8 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
 [<ffffffff81484faf>] __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:439
 [<ffffffff826b3105>] ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987
 [<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
 [<ffffffff823c805c>] ip_do_fragment+0x187c/0x1f70 net/ipv4/ip_output.c:635
 [<ffffffff823cbd7b>] ip_fragment.constprop.0+0x14b/0x200 net/ipv4/ip_output.c:505
 [<ffffffff823cc1e9>] ip_finish_output+0x3b9/0xc60 net/ipv4/ip_output.c:286
 [<ffffffff823cf9f1>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823cf9f1>] ip_mc_output+0x251/0xae0 net/ipv4/ip_output.c:347
 [<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
 [<ffffffff821dc4f1>] SYSC_sendto net/socket.c:1678 [inline]
 [<ffffffff821dc4f1>] SyS_sendto+0x201/0x340 net/socket.c:1646
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Allocated by task 2904:
 [<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
 [<ffffffff823c805c>] ip_do_fragment+0x187c/0x1f70 net/ipv4/ip_output.c:635
 [<ffffffff823cbd7b>] ip_fragment.constprop.0+0x14b/0x200 net/ipv4/ip_output.c:505
 [<ffffffff823cc1e9>] ip_finish_output+0x3b9/0xc60 net/ipv4/ip_output.c:286
 [<ffffffff823cf9f1>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff823cf9f1>] ip_mc_output+0x251/0xae0 net/ipv4/ip_output.c:347
 [<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
 [<ffffffff821dc4f1>] SYSC_sendto net/socket.c:1678 [inline]
 [<ffffffff821dc4f1>] SyS_sendto+0x201/0x340 net/socket.c:1646
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

Freed by task 1924:
 [<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
 [<ffffffff8121f320>] syslog_print kernel/printk/printk.c:1207 [inline]
 [<ffffffff8121f320>] do_syslog kernel/printk/printk.c:1336 [inline]
 [<ffffffff8121f320>] do_syslog+0x900/0xaf0 kernel/printk/printk.c:1306
 [<ffffffff81608274>] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39
 [<ffffffff815e03bd>] proc_reg_read+0xfd/0x180 fs/proc/inode.c:202
 [<ffffffff81496556>] __vfs_read+0x116/0x3c0 fs/read_write.c:434
 [<ffffffff81498264>] vfs_read+0x134/0x360 fs/read_write.c:456
 [<ffffffff8149aa8c>] SYSC_read fs/read_write.c:571 [inline]
 [<ffffffff8149aa8c>] SyS_read+0xdc/0x1c0 fs/read_write.c:564
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a

The buggy address belongs to the object at ffff8801bb3d0000
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 688 bytes inside of
 1024-byte region [ffff8801bb3d0000, ffff8801bb3d0400)
The buggy address belongs to the page:
page:ffffea0006ecf400 count:0 mapcount:1 mapping:          (null) index:0x0
BUG: unable to handle kernel 
flags: 0x0(
paging request
)
 at fffff94000dd9e80
page dumped because: VM_BUG_ON_PAGE(PageSlab(page))
IP: [<ffffffff81add4d9>] memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:62
PGD 330c067 PUD 330b063 PMD 330a063 PTE 800000000330d161
Oops: 0003 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2124 Comm: syz-executor.5 Not tainted 4.4.174+ #4
task: ffff8800b7ed0000 task.stack: ffff8801cf2b0000
RIP: 0010:[<ffffffff81add4d9>]  [<ffffffff81add4d9>] memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:62
RSP: 0018:ffff8801cf2b76a0  EFLAGS: 00010206
RAX: 1ffffd4000dd9e00 RBX: fffff94000dd9e89 RCX: 0000000000000009
RDX: 0000000000000009 RSI: 0000000000000000 RDI: fffff94000dd9e80
RBP: ffff8801cf2b76b8 R08: 0000000000000002 R09: fffff94000dd9e80
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000048
R13: ffffea0006ecf400 R14: ffffea0006ecf447 R15: ffff8801da548780
FS:  00000000023b0940(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff94000dd9e80 CR3: 00000001c07f2000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81484025 ffffea0006ecf448 0000000002008000 ffff8801cf2b76f8
 ffffffff8148412c ffffea0006ecf447 4000000000004080 ffff8801da548780
 0000000002008000 ffffffff81953367 ffffea0006ecf400 ffff8801cf2b7708
Call Trace:
 [<ffffffff8148412c>] kasan_kmalloc+0x4c/0xd0 mm/kasan/kasan.c:611
 [<ffffffff8148475f>] kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:554
 [<ffffffff8147fe9c>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff8147fe9c>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff8147fe9c>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff8147fe9c>] kmem_cache_alloc+0xdc/0x2c0 mm/slub.c:2628
 [<ffffffff81953367>] kmem_cache_zalloc include/linux/slab.h:610 [inline]
 [<ffffffff81953367>] avc_alloc_node+0x27/0x3c0 security/selinux/avc.c:551
 [<ffffffff81954992>] avc_insert security/selinux/avc.c:670 [inline]
 [<ffffffff81954992>] avc_compute_av+0x182/0x610 security/selinux/avc.c:976
 [<ffffffff81956338>] avc_has_perm_noaudit+0x2a8/0x300 security/selinux/avc.c:1112
 [<ffffffff8196653f>] selinux_inode_permission+0x27f/0x4a0 security/selinux/hooks.c:2902
 [<ffffffff8194d569>] security_inode_permission+0xb9/0x100 security/security.c:600
 [<ffffffff814b6d86>] __inode_permission2+0x96/0x250 fs/namei.c:425
 [<ffffffff814b6fa2>] inode_permission2+0x32/0x110 fs/namei.c:475
 [<ffffffff814c1b98>] may_lookup fs/namei.c:1706 [inline]
 [<ffffffff814c1b98>] link_path_walk+0x198/0x15e0 fs/namei.c:1970
 [<ffffffff814c3e3a>] path_lookupat.isra.0+0x6a/0x3f0 fs/namei.c:2194
 [<ffffffff814cae94>] filename_lookup+0x1a4/0x3b0 fs/namei.c:2229
 [<ffffffff814cb1f3>] user_path_at_empty+0x43/0x50 fs/namei.c:2403
 [<ffffffff814a52e6>] user_path_at include/linux/namei.h:52 [inline]
 [<ffffffff814a52e6>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff814a65f7>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff814a65f7>] SYSC_newlstat fs/stat.c:283 [inline]
 [<ffffffff814a65f7>] SyS_newlstat+0x97/0x110 fs/stat.c:277
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 
RIP  [<ffffffff81add4d9>] memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:61
 RSP <ffff8801cf2b76a0>
CR2: fffff94000dd9e80
---[ end trace 959521ff44d343cb ]---