kernel msg: ebtables bug: please report to author: Valid hook without chain ================================================================== BUG: KASAN: use-after-free in xfrm_policy_insert_inexact_list net/xfrm/xfrm_policy.c:1497 [inline] BUG: KASAN: use-after-free in xfrm_policy_inexact_insert+0xcd1/0xee0 net/xfrm/xfrm_policy.c:1202 Read of size 1 at addr ffff888089565d59 by task syz-executor2/28754 CPU: 0 PID: 28754 Comm: syz-executor2 Not tainted 4.20.0+ #362 kernel msg: ebtables bug: please report to author: Valid hook without chain Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 xfrm_policy_insert_inexact_list net/xfrm/xfrm_policy.c:1497 [inline] xfrm_policy_inexact_insert+0xcd1/0xee0 net/xfrm/xfrm_policy.c:1202 xfrm_policy_insert+0x639/0x850 net/xfrm/xfrm_policy.c:1570 xfrm_add_policy+0x2a0/0x6f0 net/xfrm/xfrm_user.c:1657 xfrm_user_rcv_msg+0x44c/0x8e0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x16c/0x430 net/netlink/af_netlink.c:2477 xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x59f/0x750 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 net/socket.c:2154 kernel msg: ebtables bug: please report to author: Valid hook without chain __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 kernel msg: ebtables bug: please report to author: Valid hook without chain entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9f1543ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000000000000 RSI: 000000002014f000 RDI: 000000000000000a RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9f1543b6d4 R13: 00000000004c4dd6 R14: 00000000004d8580 R15: 00000000ffffffff Allocated by task 28345: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3698 __kmalloc_reserve.isra.40+0x41/0xe0 net/core/skbuff.c:140 __alloc_skb+0x155/0x760 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] __tcp_send_ack.part.43+0x67/0x5a0 net/ipv4/tcp_output.c:3628 __tcp_send_ack net/ipv4/tcp_output.c:3655 [inline] tcp_send_ack+0x85/0xa0 net/ipv4/tcp_output.c:3655 __tcp_ack_snd_check+0x1cf/0xa90 net/ipv4/tcp_input.c:5192 tcp_rcv_established+0x18cf/0x2250 net/ipv4/tcp_input.c:5623 tcp_v4_do_rcv+0x62f/0x8e0 net/ipv4/tcp_ipv4.c:1538 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12f/0x390 net/core/sock.c:2284 release_sock+0xad/0x2c0 net/core/sock.c:2797 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1444 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 28345: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 skb_free_head+0x93/0xb0 net/core/skbuff.c:553 skb_release_data+0x706/0x990 net/core/skbuff.c:573 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] kfree_skb_partial+0x54/0x70 net/core/skbuff.c:4813 tcp_add_backlog+0x19fd/0x1e00 net/ipv4/tcp_ipv4.c:1710 tcp_v4_rcv+0x3697/0x3b10 net/ipv4/tcp_ipv4.c:1913 ip_protocol_deliver_rcu+0xb6/0xa20 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x234/0x380 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xed/0x600 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5083 process_backlog+0x217/0x760 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x7c5/0x1950 net/core/dev.c:6412 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 The buggy address belongs to the object at ffff888089565b40 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 537 bytes inside of 1024-byte region [ffff888089565b40, ffff888089565f40) The buggy address belongs to the page: page:ffffea0002255900 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001a3de88 ffffea000249fe08 ffff88812c3f0ac0 raw: 0000000000000000 ffff888089564040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888089565c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888089565c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888089565d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888089565d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888089565e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================