==================================================================
BUG: KASAN: use-after-free in __nft_trace_packet+0x130/0x14c net/netfilter/nf_tables_core.c:30
Read of size 2 at addr ffff0000d3393940 by task syz.2.159/4576

CPU: 1 PID: 4576 Comm: syz.2.159 Not tainted 5.15.188-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307
 __nft_trace_packet+0x130/0x14c net/netfilter/nf_tables_core.c:30
 __nft_trace_verdict+0x64/0x94 net/netfilter/nf_tables_core.c:100
 nft_trace_verdict net/netfilter/nf_tables_core.c:110 [inline]
 nft_do_chain+0xf24/0x1100 net/netfilter/nf_tables_core.c:256
 nft_do_chain_inet+0x1e0/0x2b4 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:584
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:300
 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:475
 dst_input include/net/dst.h:462 [inline]
 ip6_rcv_finish+0x1fc/0x234 net/ipv6/ip6_input.c:79
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:300
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:477
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401
 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip6_finish_output2+0x1370/0x1a14 net/ipv6/ip6_output.c:131
 __ip6_finish_output+0x570/0x6dc net/ipv6/ip6_output.c:201
 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x274/0x500 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:452 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_xmit+0x112c/0x188c net/ipv6/ip6_output.c:338
 inet6_csk_xmit+0x3a0/0x60c net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404
 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline]
 tcp_send_syn_data net/ipv4/tcp_output.c:3853 [inline]
 tcp_connect+0x23c0/0x3dc8 net/ipv4/tcp_output.c:3892
 tcp_v6_connect+0xde4/0x1460 net/ipv6/tcp_ipv6.c:337
 __inet_stream_connect+0x200/0xc00 net/ipv4/af_inet.c:672
 tcp_sendmsg_fastopen+0x30c/0x558 net/ipv4/tcp.c:1195
 tcp_sendmsg_locked+0x2840/0x2ce8 net/ipv4/tcp.c:1237
 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457
 inet6_sendmsg+0xb4/0xd8 net/ipv6/af_inet6.c:667
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x2e8/0x3d8 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4576:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x74/0x408 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 kmem_cache_alloc_node+0x204/0x41c mm/slub.c:3256
 __alloc_skb+0x134/0x67c net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1162 [inline]
 synproxy_send_client_synack_ipv6+0x124/0x9a4 net/netfilter/nf_synproxy_core.c:895
 nft_synproxy_eval_v6+0x17c/0x2b8 net/netfilter/nft_synproxy.c:90
 nft_synproxy_do_eval+0x338/0x484 net/netfilter/nft_synproxy.c:145
 nft_synproxy_eval+0x34/0x48 net/netfilter/nft_synproxy.c:247
 expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
 nft_do_chain+0x3f0/0x1100 net/netfilter/nf_tables_core.c:238
 nft_do_chain_inet+0x1e0/0x2b4 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:584
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:300
 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:475
 dst_input include/net/dst.h:462 [inline]
 ip6_rcv_finish+0x1fc/0x234 net/ipv6/ip6_input.c:79
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:300
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:477
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401
 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip6_finish_output2+0x1370/0x1a14 net/ipv6/ip6_output.c:131
 __ip6_finish_output+0x570/0x6dc net/ipv6/ip6_output.c:201
 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x274/0x500 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:452 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_xmit+0x112c/0x188c net/ipv6/ip6_output.c:338
 inet6_csk_xmit+0x3a0/0x60c net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404
 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline]
 tcp_send_syn_data net/ipv4/tcp_output.c:3853 [inline]
 tcp_connect+0x23c0/0x3dc8 net/ipv4/tcp_output.c:3892
 tcp_v6_connect+0xde4/0x1460 net/ipv6/tcp_ipv6.c:337
 __inet_stream_connect+0x200/0xc00 net/ipv4/af_inet.c:672
 tcp_sendmsg_fastopen+0x30c/0x558 net/ipv4/tcp.c:1195
 tcp_sendmsg_locked+0x2840/0x2ce8 net/ipv4/tcp.c:1237
 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457
 inet6_sendmsg+0xb4/0xd8 net/ipv6/af_inet6.c:667
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x2e8/0x3d8 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Freed by task 4576:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515
 kfree_skbmem+0x114/0x1b0 net/core/skbuff.c:-1
 __kfree_skb net/core/skbuff.c:757 [inline]
 consume_skb+0x140/0x33c net/core/skbuff.c:914
 nft_synproxy_eval_v6+0x184/0x2b8 net/netfilter/nft_synproxy.c:-1
 nft_synproxy_do_eval+0x338/0x484 net/netfilter/nft_synproxy.c:145
 nft_synproxy_eval+0x34/0x48 net/netfilter/nft_synproxy.c:247
 expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
 nft_do_chain+0x3f0/0x1100 net/netfilter/nf_tables_core.c:238
 nft_do_chain_inet+0x1e0/0x2b4 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:584
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:300
 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:475
 dst_input include/net/dst.h:462 [inline]
 ip6_rcv_finish+0x1fc/0x234 net/ipv6/ip6_input.c:79
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:300
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:477
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401
 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip6_finish_output2+0x1370/0x1a14 net/ipv6/ip6_output.c:131
 __ip6_finish_output+0x570/0x6dc net/ipv6/ip6_output.c:201
 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x274/0x500 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:452 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_xmit+0x112c/0x188c net/ipv6/ip6_output.c:338
 inet6_csk_xmit+0x3a0/0x60c net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404
 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline]
 tcp_send_syn_data net/ipv4/tcp_output.c:3853 [inline]
 tcp_connect+0x23c0/0x3dc8 net/ipv4/tcp_output.c:3892
 tcp_v6_connect+0xde4/0x1460 net/ipv6/tcp_ipv6.c:337
 __inet_stream_connect+0x200/0xc00 net/ipv4/af_inet.c:672
 tcp_sendmsg_fastopen+0x30c/0x558 net/ipv4/tcp.c:1195
 tcp_sendmsg_locked+0x2840/0x2ce8 net/ipv4/tcp.c:1237
 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457
 inet6_sendmsg+0xb4/0xd8 net/ipv6/af_inet6.c:667
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x2e8/0x3d8 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000d33938c0
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 128 bytes inside of
 232-byte region [ffff0000d33938c0, ffff0000d33939a8)
The buggy address belongs to the page:
page:00000000a4a1c423 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113393
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0858000
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d3393800: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff0000d3393880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff0000d3393900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff0000d3393980: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d3393a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================