===================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x37b/0x530 net/core/skbuff.c:2851 CPU: 0 PID: 12617 Comm: syz-fuzzer Not tainted 5.4.0-rc5-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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 __skb_checksum_complete+0x37b/0x530 net/core/skbuff.c:2851 nf_ip_checksum+0x567/0x770 net/netfilter/utils.c:36 nf_nat_icmp_reply_translation+0x2ba/0x970 net/netfilter/nf_nat_proto.c:567 nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:626 [inline] nf_nat_ipv4_local_fn+0x215/0x840 net/netfilter/nf_nat_proto.c:697 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x18b/0x3f0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] __ip_local_out+0x69b/0x800 net/ipv4/ip_output.c:114 ip_local_out net/ipv4/ip_output.c:123 [inline] ip_send_skb net/ipv4/ip_output.c:1558 [inline] ip_push_pending_frames+0x16f/0x460 net/ipv4/ip_output.c:1578 icmp_push_reply+0x692/0x750 net/ipv4/icmp.c:389 __icmp_send+0x2313/0x3080 net/ipv4/icmp.c:738 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline] ipv4_link_failure+0x73c/0xaf0 net/ipv4/route.c:1227 dst_link_failure include/net/dst.h:419 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:996 neigh_timer_handler+0xda4/0x1450 net/core/neighbour.c:1082 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 RIP: 0033:0x73add0 Code: 44 24 60 48 8b 4c 24 40 48 8b 5c 24 68 eb bc bb 00 00 00 00 e9 41 fe ff ff e8 ec f0 d1 ff e9 e7 fd ff ff cc cc cc cc cc cc cc <64> 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 f2 01 00 00 48 81 ec RSP: 002b:000000c436f60548 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 000000c43b192760 RBX: 000000c43b190700 RCX: 0000000000bf98e0 RDX: 000000c436f606f0 RSI: 000000000073add0 RDI: 0000000000456cd0 RBP: 000000c436f60650 R08: 000000c42007f380 R09: 0000000000000003 R10: 0000000000000008 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000004 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 csum_partial_copy+0xae/0x100 lib/checksum.c:174 skb_copy_and_csum_bits+0x214/0x10b0 net/core/skbuff.c:2738 icmp_glue_bits+0x16b/0x380 net/ipv4/icmp.c:352 __ip_append_data+0x41c3/0x52c0 net/ipv4/ip_output.c:1132 ip_append_data+0x324/0x480 net/ipv4/ip_output.c:1313 icmp_push_reply+0x210/0x750 net/ipv4/icmp.c:370 __icmp_send+0x2313/0x3080 net/ipv4/icmp.c:738 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline] ipv4_link_failure+0x73c/0xaf0 net/ipv4/route.c:1227 dst_link_failure include/net/dst.h:419 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:996 neigh_timer_handler+0xda4/0x1450 net/core/neighbour.c:1082 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 skb_put_data include/linux/skbuff.h:2217 [inline] sctp_packet_pack net/sctp/output.c:470 [inline] sctp_packet_transmit+0x1d9e/0x4250 net/sctp/output.c:597 sctp_outq_flush_transports net/sctp/outqueue.c:1146 [inline] sctp_outq_flush+0x1823/0x5d80 net/sctp/outqueue.c:1194 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:757 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1781 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline] sctp_do_sm+0x8fe1/0x9720 net/sctp/sm_sideeffect.c:1155 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2433 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2686 [inline] sctp_setsockopt+0x189bb/0x19090 net/sctp/socket.c:4672 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3151 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084 __do_sys_setsockopt net/socket.c:2100 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 skb_put_data include/linux/skbuff.h:2217 [inline] sctp_addto_chunk net/sctp/sm_make_chunk.c:1494 [inline] sctp_make_heartbeat+0x612/0x9e0 net/sctp/sm_make_chunk.c:1164 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline] sctp_sf_do_prm_requestheartbeat+0x8f/0x4b0 net/sctp/sm_statefuns.c:5329 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2433 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2686 [inline] sctp_setsockopt+0x189bb/0x19090 net/sctp/socket.c:4672 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3151 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084 __do_sys_setsockopt net/socket.c:2100 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 sctp_make_heartbeat+0x3e9/0x9e0 net/sctp/sm_make_chunk.c:1156 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline] sctp_sf_do_prm_requestheartbeat+0x8f/0x4b0 net/sctp/sm_statefuns.c:5329 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2433 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2686 [inline] sctp_setsockopt+0x189bb/0x19090 net/sctp/socket.c:4672 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3151 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084 __do_sys_setsockopt net/socket.c:2100 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 sctp_transport_init net/sctp/transport.c:47 [inline] sctp_transport_new+0x248/0xa00 net/sctp/transport.c:100 sctp_assoc_add_peer+0x5ba/0x2030 net/sctp/associola.c:611 sctp_process_param net/sctp/sm_make_chunk.c:2524 [inline] sctp_process_init+0x162b/0x3e30 net/sctp/sm_make_chunk.c:2345 sctp_sf_do_5_1D_ce+0xe0f/0x30d0 net/sctp/sm_statefuns.c:767 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_endpoint_bh_rcv+0xda2/0x1050 net/sctp/endpointola.c:394 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:80 sctp_rcv+0x3a6d/0x54e0 net/sctp/input.c:256 sctp6_rcv+0x41/0x70 net/sctp/ipv6.c:1049 ip6_protocol_deliver_rcu+0x181c/0x22a0 net/ipv6/ip6_input.c:409 ip6_input_finish net/ipv6/ip6_input.c:450 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip6_input+0x2af/0x340 net/ipv6/ip6_input.c:459 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0x683/0x710 net/ipv6/ip6_input.c:284 __netif_receive_skb_one_core net/core/dev.c:5010 [inline] __netif_receive_skb net/core/dev.c:5124 [inline] process_backlog+0x721/0x1410 net/core/dev.c:5955 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----addr.i@sctp_process_init Variable was created at: sctp_process_param net/sctp/sm_make_chunk.c:2495 [inline] sctp_process_init+0x603/0x3e30 net/sctp/sm_make_chunk.c:2345 sctp_process_param net/sctp/sm_make_chunk.c:2495 [inline] sctp_process_init+0x603/0x3e30 net/sctp/sm_make_chunk.c:2345 =====================================================