sctp: [Deprecated]: syz-executor0 (pid 498) Use of int in max_burst socket option.
Use struct sctp_assoc_value instead
netlink: 'syz-executor4': attribute type 1 has an invalid length.
==================================================================
BUG: KASAN: use-after-free in qdisc_pkt_len include/net/sch_generic.h:610 [inline]
BUG: KASAN: use-after-free in qdisc_qstats_cpu_backlog_inc include/net/sch_generic.h:712 [inline]
BUG: KASAN: use-after-free in pfifo_fast_enqueue+0x4bc/0x5e0 net/sched/sch_generic.c:639
Read of size 4 at addr ffff8801d364aaa8 by task syz-executor6/501

CPU: 1 PID: 501 Comm: syz-executor6 Not tainted 4.16.0-rc4+ #267
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23c/0x360 mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 qdisc_pkt_len include/net/sch_generic.h:610 [inline]
 qdisc_qstats_cpu_backlog_inc include/net/sch_generic.h:712 [inline]
 pfifo_fast_enqueue+0x4bc/0x5e0 net/sched/sch_generic.c:639
 __dev_xmit_skb net/core/dev.c:3216 [inline]
 __dev_queue_xmit+0xd50/0x2f30 net/core/dev.c:3517
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
 neigh_hh_output include/net/neighbour.h:472 [inline]
 neigh_output include/net/neighbour.h:480 [inline]
 ip6_finish_output2+0x1472/0x23d0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
 ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1677
 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1697
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x2f96/0x40c0 net/ipv6/raw.c:935
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2047
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2137
 SYSC_sendmmsg net/socket.c:2168 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2163
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453e69
RSP: 002b:00007f2733035c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f27330366d4 RCX: 0000000000453e69
RDX: 0000000000000249 RSI: 0000000020001300 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004b4 R14: 00000000006f7180 R15: 0000000000000000

Allocated by task 501:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc_node+0x144/0x760 mm/slab.c:3631
 __alloc_skb+0xf1/0x780 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:986 [inline]
 sock_wmalloc+0x140/0x1d0 net/core/sock.c:1940
 __ip6_append_data.isra.43+0x26b9/0x3390 net/ipv6/ip6_output.c:1416
 ip6_append_data+0x189/0x290 net/ipv6/ip6_output.c:1571
 rawv6_sendmsg+0x1e09/0x40c0 net/ipv6/raw.c:928
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2047
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2137
 SYSC_sendmmsg net/socket.c:2168 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2163
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 508:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kmem_cache_free+0x83/0x2a0 mm/slab.c:3743
 kfree_skbmem+0x1a1/0x1d0 net/core/skbuff.c:582
 __kfree_skb net/core/skbuff.c:642 [inline]
 kfree_skb+0x165/0x4c0 net/core/skbuff.c:659
 ip_tunnel_xmit+0x710/0x3550 net/ipv4/ip_tunnel.c:778
 __gre_xmit+0x546/0x8b0 net/ipv4/ip_gre.c:449
 erspan_xmit+0x779/0x22a0 net/ipv4/ip_gre.c:731
 __netdev_start_xmit include/linux/netdevice.h:4078 [inline]
 netdev_start_xmit include/linux/netdevice.h:4087 [inline]
 xmit_one net/core/dev.c:3026 [inline]
 dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042
 sch_direct_xmit+0x40d/0x1140 net/sched/sch_generic.c:327
 qdisc_restart net/sched/sch_generic.c:393 [inline]
 __qdisc_run+0x57d/0x19c0 net/sched/sch_generic.c:401
 __dev_xmit_skb net/core/dev.c:3217 [inline]
 __dev_queue_xmit+0xd5e/0x2f30 net/core/dev.c:3517
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3582
 neigh_hh_output include/net/neighbour.h:472 [inline]
 neigh_output include/net/neighbour.h:480 [inline]
 ip6_finish_output2+0x1472/0x23d0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x69b/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
 ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1677
 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1697
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x2f96/0x40c0 net/ipv6/raw.c:935
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2047
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2137
 SYSC_sendmmsg net/socket.c:2168 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2163
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801d364aa80
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 40 bytes inside of
 232-byte region [ffff8801d364aa80, ffff8801d364ab68)
The buggy address belongs to the page:
page:ffffea00074d9280 count:1 mapcount:0 mapping:ffff8801d364a080 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d364a080 0000000000000000 000000010000000c
raw: ffffea0006e9d6e0 ffffea0006f7c7a0 ffff8801d9476b00 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d364a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d364aa00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
>ffff8801d364aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8801d364ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff8801d364ab80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================