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BUG: KASAN: global-out-of-bounds in nfnetlink_parse_nat net/netfilter/nf_nat_core.c:847 [inline]
BUG: KASAN: global-out-of-bounds in nfnetlink_parse_nat_setup+0x409/0x420 net/netfilter/nf_nat_core.c:884
Read of size 8 at addr ffffffff880fbdd8 by task syz-executor.2/17010

CPU: 1 PID: 17010 Comm: syz-executor.2 Not tainted 4.19.124-syzkaller #0
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+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x5/0x222 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 nfnetlink_parse_nat net/netfilter/nf_nat_core.c:847 [inline]
 nfnetlink_parse_nat_setup+0x409/0x420 net/netfilter/nf_nat_core.c:884
 ctnetlink_parse_nat_setup+0xb6/0x640 net/netfilter/nf_conntrack_netlink.c:1521
 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1596 [inline]
 ctnetlink_create_conntrack+0x501/0x12b0 net/netfilter/nf_conntrack_netlink.c:1984
 ctnetlink_new_conntrack+0x4f5/0xdd1 net/netfilter/nf_conntrack_netlink.c:2114
 nfnetlink_rcv_msg+0xc6b/0xf50 net/netfilter/nfnetlink.c:228
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 nfnetlink_rcv+0x1b2/0x420 net/netfilter/nfnetlink.c:560
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6e3/0xcc0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ca29
Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0b46063c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004fe740 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000007
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000964 R14: 00000000004cc38b R15: 00007f0b460646d4

The buggy address belongs to the variable:
 nft_flow_offload_policy+0x38/0x100

Memory state around the buggy address:
 ffffffff880fbc80: 00 00 00 00 fa fa fa fa 00 00 00 00 00 00 00 00
 ffffffff880fbd00: 00 00 00 00 00 fa fa fa fa fa fa fa 00 05 fa fa
>ffffffff880fbd80: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 07 fa
                                                    ^
 ffffffff880fbe00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00
 ffffffff880fbe80: fa fa fa fa 00 00 00 00 00 00 fa fa fa fa fa fa
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SELinux: unrecognized netlink message: protocol=4 nlmsg_type=16 sclass=netlink_tcpdiag_socket pid=17028 comm=syz-executor.3