==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801d9082f18 by task syz-executor6/32673

CPU: 0 PID: 32673 Comm: syz-executor6 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 abdb291d870260d9 ffff8800aa0af5c8 ffffffff81e15fed
 ffffea0007642080 ffff8801d9082f18 0000000000000000 ffff8801d9082f18
 0000000000001000 ffff8800aa0af600 ffffffff8151b489 ffff8801d9082f18
Call Trace:
 [<ffffffff81e15fed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15fed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b489>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b7a8>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b7a8>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe734>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff83435efc>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
 [<ffffffff83435efc>] ip6_xmit+0x177c/0x1a00 net/ipv6/ip6_output.c:237
 [<ffffffff834f60c5>] inet6_csk_xmit+0x245/0x490 net/ipv6/inet6_connection_sock.c:176
 [<ffffffff835a570c>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
 [<ffffffff835a570c>] l2tp_xmit_skb+0xb9c/0xe80 net/l2tp/l2tp_core.c:1179
 [<ffffffff835b1c60>] pppol2tp_sendmsg+0x4e0/0x7d0 net/l2tp/l2tp_ppp.c:355
 [<ffffffff82f2727c>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff82f2727c>] sock_sendmsg+0xcc/0x110 net/socket.c:648
 [<ffffffff82f28a41>] ___sys_sendmsg+0x441/0x880 net/socket.c:1975
 [<ffffffff82f2b02e>] __sys_sendmmsg+0x12e/0x2e0 net/socket.c:2060
 [<ffffffff82f2b215>] SYSC_sendmmsg net/socket.c:2090 [inline]
 [<ffffffff82f2b215>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e

Allocated by task 32673:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd7d3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdab7>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdab7>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fe082>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f9b9e>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f9b9e>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f9b9e>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f9b9e>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
 [<ffffffff82fa5835>] dst_alloc+0xb5/0x1a0 net/core/dst.c:210
 [<ffffffff831f29c8>] rt_dst_alloc+0x78/0x430 net/ipv4/route.c:1478
 [<ffffffff831fbe8c>] __mkroute_output net/ipv4/route.c:2132 [inline]
 [<ffffffff831fbe8c>] __ip_route_output_key_hash+0x9ac/0x2380 net/ipv4/route.c:2344
 [<ffffffff831fe339>] __ip_route_output_key include/net/route.h:124 [inline]
 [<ffffffff831fe339>] ip_route_output_flow+0x29/0xa0 net/ipv4/route.c:2431
 [<ffffffff832c7f43>] ip_route_connect include/net/route.h:304 [inline]
 [<ffffffff832c7f43>] __ip4_datagram_connect+0x663/0xfe0 net/ipv4/datagram.c:51
 [<ffffffff834e7cf0>] __ip6_datagram_connect+0x1280/0x1960 net/ipv6/datagram.c:105
 [<ffffffff834e83ff>] ip6_datagram_connect+0x2f/0x50 net/ipv6/datagram.c:223
 [<ffffffff83303057>] inet_dgram_connect+0x117/0x200 net/ipv4/af_inet.c:550
 [<ffffffff82f27bf8>] SYSC_connect+0x1b8/0x300 net/socket.c:1570
 [<ffffffff82f2a544>] SyS_connect+0x24/0x30 net/socket.c:1551
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e

Freed by task 26826:
 [<ffffffff81034676>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd7d3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fe102>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fe102>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fb2ee>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fb2ee>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fb2ee>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fb2ee>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
 [<ffffffff82fa4ae5>] dst_destroy.part.6+0x1f5/0x330 net/core/dst.c:270
 [<ffffffff82fa5165>] dst_destroy net/core/dst.c:252 [inline]
 [<ffffffff82fa5165>] dst_destroy_rcu+0x15/0x40 net/core/dst.c:295
 [<ffffffff81288d47>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff81288d47>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff81288d47>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff81288d47>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff81288d47>] rcu_process_callbacks+0x927/0x1440 kernel/rcu/tree.c:2957
 [<ffffffff838cfa7c>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d9082dc0
 which belongs to the cache ip_dst_cache of size 208
The buggy address is located 136 bytes to the right of
 208-byte region [ffff8801d9082dc0, ffff8801d9082e90)
The buggy address belongs to the page:
page:ffffea0007642080 count:1 mapcount:-2146697203 mapping:          (null) index:0x0
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffff8801d9082e90
IP: [<ffff8801d9082e90>] 0xffff8801d9082e90
PGD 6330067 PUD 80000001c00001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 32670 Comm: syz-executor2 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801bcbd9800 task.stack: ffff8801bb5f0000
RIP: 0010:[<ffff8801d9082e90>]  [<ffff8801d9082e90>] 0xffff8801d9082e90
RSP: 0018:ffff8801db307db0  EFLAGS: 00010006
RAX: ffff8801bcbd9800 RBX: ffff8800a9887df8 RCX: 0000000000000000
RDX: 0000000000010000 RSI: ffffffff812a0d95 RDI: ffff8800a9887df8
RBP: ffff8801db307ee0 R08: ffffffff85341110 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801bcbd9800 R12: ffff8801d9082e90
R13: ffff8801db3196c0 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f0c61fd1700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d9082e90 CR3: 00000000baad6000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff812a0d9d 0000000000000046 ffff8801db307e78 ffff8801bcbd9800
 1ffff1003b660fc3 ffff8801db319720 ffffed003b660fcf 0000000000000001
 ffff8801db319780 0303880200000005 ffff8801db3196f8 ffff8801db319798
Call Trace:
 <IRQ> 
 [<ffffffff812a2511>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359
 [<ffffffff810af544>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff838cf1dc>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff838ce120>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff811a773f>] ___might_sleep+0x1ff/0x260 kernel/sched/core.c:7956
 [<ffffffff814c8c38>] __vmalloc_area_node mm/vmalloc.c:1623 [inline]
 [<ffffffff814c8c38>] __vmalloc_node_range+0x388/0x630 mm/vmalloc.c:1672
 [<ffffffff814c8fab>] __vmalloc_node mm/vmalloc.c:1716 [inline]
 [<ffffffff814c8fab>] __vmalloc_node_flags mm/vmalloc.c:1730 [inline]
 [<ffffffff814c8fab>] vmalloc+0x5b/0x70 mm/vmalloc.c:1745
 [<ffffffff83167a91>] xt_alloc_entry_offsets+0x41/0x60 net/netfilter/x_tables.c:757
 [<ffffffff8339c1a5>] translate_table+0x215/0x16b0 net/ipv4/netfilter/ip_tables.c:824
 [<ffffffff8339fd63>] do_replace net/ipv4/netfilter/ip_tables.c:1299 [inline]
 [<ffffffff8339fd63>] do_ipt_set_ctl+0x2b3/0x450 net/ipv4/netfilter/ip_tables.c:1862
 [<ffffffff830cfd0d>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline]
 [<ffffffff830cfd0d>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114
 [<ffffffff8322fe2a>] ip_setsockopt+0x9a/0xb0 net/ipv4/ip_sockglue.c:1228
 [<ffffffff832d554a>] udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2162
 [<ffffffff8348d0ba>] ipv6_setsockopt+0x10a/0x130 net/ipv6/ipv6_sockglue.c:899
 [<ffffffff8349bdaa>] udpv6_setsockopt+0x4a/0x90 net/ipv6/udp.c:1436
 [<ffffffff82f2d92a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2659
 [<ffffffff82f2a836>] SYSC_setsockopt net/socket.c:1780 [inline]
 [<ffffffff82f2a836>] SyS_setsockopt+0x166/0x260 net/socket.c:1759
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 78 0b 22 db 01 88 ff ff 78 d9 3a ab 01 88 ff ff 40 0b 22 db 01 88 ff ff <a1> 7f 00 00 66 01 20 a2 ca 68 00 00 1c 01 a0 a0 67 a0 7f 1f 02 
RIP  [<ffff8801d9082e90>] 0xffff8801d9082e90
 RSP <ffff8801db307db0>
CR2: ffff8801d9082e90
---[ end trace 1fefc96bbcac4f34 ]---