==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987
netlink: 2 bytes leftover after parsing attributes in process `syz-executor.2'.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket
Read of size 16 at addr ffff8800b91f3430 by task syz-executor.1/12872
CPU: 1 PID: 12872 Comm: syz-executor.1 Not tainted 4.4.174+ #4
0000000000000000 8e9a6f5b3377468f ffff8801cfed6cd0 ffffffff81aad1a1
0000000000000000 ffffea0002e47c00 ffff8800b91f3430 0000000000000010
ffff8800b91f3180 ffff8801cfed6d08 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
[<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
[<ffffffff821d9e69>] ___sys_sendmsg+0x369/0x890 net/socket.c:1975
[<ffffffff821dd2e0>] __sys_sendmmsg+0x130/0x2e0 net/socket.c:2060
[<ffffffff821dd4c5>] SYSC_sendmmsg net/socket.c:2090 [inline]
[<ffffffff821dd4c5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Allocated by task 12872:
[<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
[<ffffffff821d9e69>] ___sys_sendmsg+0x369/0x890 net/socket.c:1975
[<ffffffff821dd2e0>] __sys_sendmmsg+0x130/0x2e0 net/socket.c:2060
[<ffffffff821dd4c5>] SYSC_sendmmsg net/socket.c:2090 [inline]
[<ffffffff821dd4c5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Freed by task 2121:
[<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
[<ffffffff8251fe09>] __do_replace+0x409/0x650 net/ipv6/netfilter/ip6_tables.c:1260
[<ffffffff825259f1>] do_replace net/ipv4/netfilter/ip_tables.c:1305 [inline]
[<ffffffff825259f1>] do_ipt_set_ctl+0x2e1/0x450 net/ipv4/netfilter/ip_tables.c:1862
[<ffffffff822fcfad>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline]
[<ffffffff822fcfad>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114
[<ffffffff823da69a>] ip_setsockopt net/ipv4/ip_sockglue.c:1225 [inline]
[<ffffffff823da69a>] ip_setsockopt+0x8a/0xa0 net/ipv4/ip_sockglue.c:1210
[<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 ffff8800b91f3180
which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 688 bytes inside of
1024-byte region [ffff8800b91f3180, ffff8800b91f3580)
The buggy address belongs to the page:
audit: type=1400 audit(1574895875.935:1519): avc: denied { sigchld } for pid=2121 comm="syz-executor.1" scontext=system_u:object_r:unlabeled_t:s0 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=process permissive=0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access[ 3407.370090] ------------[ cut here ]------------
WARNING: CPU: 0 PID: 2121 at kernel/sched/core.c:7941 __might_sleep+0x138/0x1a0 kernel/sched/core.c:7941()
do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff810de6f5>] do_wait+0x265/0xa00 kernel/exit.c:1511