================================================================== BUG: KASAN: use-after-free in hlist_add_head_rcu include/linux/rculist.h:593 [inline] BUG: KASAN: use-after-free in nf_nat_setup_info+0x1778/0x2188 net/netfilter/nf_nat_core.c:633 Write of size 8 at addr ffff0000cef114d8 by task syz-executor.3/15037 CPU: 0 PID: 15037 Comm: syz-executor.3 Not tainted 6.1.76-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_store8_noabort+0x2c/0x38 mm/kasan/report_generic.c:356 hlist_add_head_rcu include/linux/rculist.h:593 [inline] nf_nat_setup_info+0x1778/0x2188 net/netfilter/nf_nat_core.c:633 __nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:664 [inline] nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:670 [inline] nf_nat_inet_fn+0x80c/0xad4 net/netfilter/nf_nat_core.c:759 nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:645 [inline] nf_nat_ipv4_local_in+0x1bc/0x4bc net/netfilter/nf_nat_proto.c:708 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xc8/0x1f4 net/netfilter/core.c:614 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK+0x22c/0x3d4 include/linux/netfilter.h:300 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:454 [inline] ip_rcv_finish+0x224/0x250 net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:302 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5528 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5642 process_backlog+0x410/0x784 net/core/dev.c:5970 __napi_poll+0xb4/0x3f0 net/core/dev.c:6537 napi_poll net/core/dev.c:6604 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6715 __do_softirq+0x314/0xe38 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84 do_softirq+0xf8/0x1ac kernel/softirq.c:472 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:396 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33 rcu_read_unlock_bh include/linux/rcupdate.h:829 [inline] __dev_queue_xmit+0x1a68/0x38d8 net/core/dev.c:4320 dev_queue_xmit include/linux/netdevice.h:3021 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0xc58/0x1198 net/ipv4/ip_output.c:228 __ip_finish_output+0x1b0/0x458 ip_finish_output+0x40/0x268 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x330/0x49c net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xd8c/0x1840 net/ipv4/ip_output.c:532 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x1954/0x3258 net/ipv4/tcp_output.c:1403 tcp_transmit_skb net/ipv4/tcp_output.c:1421 [inline] tcp_write_xmit+0x131c/0x4e2c net/ipv4/tcp_output.c:2709 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2894 tcp_push+0x44c/0x68c net/ipv4/tcp.c:733 tcp_sendmsg_locked+0x2ca8/0x34f8 net/ipv4/tcp.c:1461 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1489 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:839 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x55c/0x848 net/socket.c:2514 ___sys_sendmsg net/socket.c:2568 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2654 __do_sys_sendmmsg net/socket.c:2683 [inline] __se_sys_sendmmsg net/socket.c:2680 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2680 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 15037: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1050 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] nf_ct_tmpl_alloc+0x90/0x1f4 net/netfilter/nf_conntrack_core.c:550 nft_ct_set_zone_eval+0x3c8/0x600 net/netfilter/nft_ct.c:270 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline] nft_do_chain+0x440/0x1544 net/netfilter/nf_tables_core.c:264 nft_do_chain_ipv4+0x1a4/0x2d8 net/netfilter/nft_chain_filter.c:23 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xc8/0x1f4 net/netfilter/core.c:614 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK+0x22c/0x3d4 include/linux/netfilter.h:300 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5528 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5642 process_backlog+0x410/0x784 net/core/dev.c:5970 __napi_poll+0xb4/0x3f0 net/core/dev.c:6537 napi_poll net/core/dev.c:6604 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6715 __do_softirq+0x314/0xe38 kernel/softirq.c:571 Freed by task 15037: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 nf_ct_tmpl_free net/netfilter/nf_conntrack_core.c:571 [inline] nf_ct_destroy+0x198/0x298 net/netfilter/nf_conntrack_core.c:593 nf_conntrack_destroy+0x124/0x2c8 net/netfilter/core.c:703 nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:37 [inline] skb_release_head_state+0x180/0x28c net/core/skbuff.c:846 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x178/0x47c net/core/skbuff.c:893 nf_hook_slow+0x188/0x1f4 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK+0x22c/0x3d4 include/linux/netfilter.h:300 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:454 [inline] ip_rcv_finish+0x224/0x250 net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:302 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5528 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5642 process_backlog+0x410/0x784 net/core/dev.c:5970 __napi_poll+0xb4/0x3f0 net/core/dev.c:6537 napi_poll net/core/dev.c:6604 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6715 __do_softirq+0x314/0xe38 kernel/softirq.c:571 The buggy address belongs to the object at ffff0000cef11400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 216 bytes inside of 512-byte region [ffff0000cef11400, ffff0000cef11600) The buggy address belongs to the physical page: page:000000004c5ffd70 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ef10 head:000000004c5ffd70 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003512e00 dead000000000003 ffff0000c0002600 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cef11380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000cef11400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000cef11480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cef11500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cef11580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================