================================================================== BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:192 [inline] BUG: KASAN: use-after-free in ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264 kernel msg: ebtables bug: please report to author: Wrong len argument Read of size 8 at addr ffff8801c8008c18 by task syz-executor4/13664 CPU: 0 PID: 13664 Comm: syz-executor4 Not tainted 4.16.0-rc5+ #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 kernel msg: ebtables bug: please report to author: Wrong len argument 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_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ip6_dst_idev include/net/ip6_fib.h:192 [inline] ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139 l2tp_xmit_core net/l2tp/l2tp_core.c:1053 [inline] l2tp_xmit_skb+0x105f/0x1410 net/l2tp/l2tp_core.c:1148 pppol2tp_sendmsg+0x470/0x670 net/l2tp/l2tp_ppp.c:341 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f45c99 RSP: 002b:00000000f774109c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000020000080 RDX: 0000000000000090 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 10411: 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+0x12e/0x760 mm/slab.c:3541 dst_alloc+0x11f/0x1a0 net/core/dst.c:104 rt_dst_alloc+0xe9/0x520 net/ipv4/route.c:1507 __mkroute_output net/ipv4/route.c:2251 [inline] ip_route_output_key_hash_rcu+0xa59/0x2f00 net/ipv4/route.c:2479 ip_route_output_key_hash+0x20b/0x370 net/ipv4/route.c:2308 __ip_route_output_key include/net/route.h:125 [inline] ip_route_output_flow+0x26/0xa0 net/ipv4/route.c:2562 ip_route_output_key include/net/route.h:135 [inline] sctp_v4_get_dst+0x5f9/0x15b0 net/sctp/protocol.c:458 sctp_transport_route+0xa8/0x430 net/sctp/transport.c:293 sctp_assoc_add_peer+0x4fe/0x1190 net/sctp/associola.c:655 sctp_process_param net/sctp/sm_make_chunk.c:2546 [inline] sctp_process_init+0x1567/0x2440 net/sctp/sm_make_chunk.c:2362 sctp_sf_do_unexpected_init.isra.37+0x73d/0x13b0 net/sctp/sm_statefuns.c:1519 sctp_sf_do_5_2_1_siminit+0x35/0x40 net/sctp/sm_statefuns.c:1648 sctp_do_sm+0x192/0x6ed0 net/sctp/sm_sideeffect.c:1178 sctp_assoc_bh_rcv+0x283/0x4b0 net/sctp/associola.c:1065 sctp_inq_push+0x23b/0x300 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x177/0xa90 net/sctp/input.c:350 sk_backlog_rcv include/net/sock.h:908 [inline] __release_sock+0x124/0x360 net/core/sock.c:2271 release_sock+0xa4/0x2a0 net/core/sock.c:2786 sctp_wait_for_connect+0x346/0x570 net/sctp/socket.c:8236 __sctp_connect+0xa90/0xca0 net/sctp/socket.c:1255 sctp_connect+0xb4/0xf0 net/sctp/socket.c:4307 inet_dgram_connect+0x16b/0x1f0 net/ipv4/af_inet.c:542 SYSC_connect+0x213/0x4a0 net/socket.c:1639 SyS_connect+0x24/0x30 net/socket.c:1620 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 7: 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 dst_destroy+0x257/0x370 net/core/dst.c:140 dst_destroy_rcu+0x16/0x20 net/core/dst.c:153 __rcu_reclaim kernel/rcu/rcu.h:172 [inline] rcu_do_batch kernel/rcu/tree.c:2674 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline] rcu_process_callbacks+0xd6c/0x17f0 kernel/rcu/tree.c:2917 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801c8008c00 which belongs to the cache ip_dst_cache of size 168 The buggy address is located 24 bytes inside of 168-byte region [ffff8801c8008c00, ffff8801c8008ca8) The buggy address belongs to the page: page:ffffea0007200200 count:1 mapcount:0 mapping:ffff8801c8008000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c8008000 0000000000000000 0000000100000010 raw: ffffea0006c0db20 ffffea0006b3f020 ffff8801d54394c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8008b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c8008b80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff8801c8008c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c8008c80: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff8801c8008d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================