syzbot

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BUG: KMSAN: uninit-value in nf_ip_checksum+0x758/0x770 net/netfilter/utils.c:21
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.5.0-rc1-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+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf8/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 nf_ip_checksum+0x758/0x770 net/netfilter/utils.c:21
 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_in+0x2a7/0x580 net/netfilter/nf_nat_proto.c:644
 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:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_rcv+0x259/0x750 net/ipv4/ip_input.c:538
 __netif_receive_skb_one_core net/core/dev.c:5150 [inline]
 __netif_receive_skb net/core/dev.c:5264 [inline]
 process_backlog+0xece/0x13c0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6600
 __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:353

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 __skb_checksum_complete+0x419/0x530 net/core/skbuff.c:2859
 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:262 [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:1562 [inline]
 ip_push_pending_frames+0x16f/0x460 net/ipv4/ip_output.c:1582
 icmp_push_reply+0x692/0x750 net/ipv4/icmp.c:390
 __icmp_send+0x2358/0x30d0 net/ipv4/icmp.c:740
 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+0x362/0x8f0 net/core/neighbour.c:996
 neigh_timer_handler+0xdc0/0x14c0 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

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x44/0x50 mm/kmsan/kmsan_instr.c:116
 csum_partial_copy+0xae/0x100 lib/checksum.c:174
 skb_copy_and_csum_bits+0x205/0x10b0 net/core/skbuff.c:2738
 icmp_glue_bits+0x16b/0x380 net/ipv4/icmp.c:353
 __ip_append_data+0x46a6/0x5500 net/ipv4/ip_output.c:1133
 ip_append_data+0x328/0x480 net/ipv4/ip_output.c:1317
 icmp_push_reply+0x210/0x750 net/ipv4/icmp.c:371
 __icmp_send+0x2358/0x30d0 net/ipv4/icmp.c:740
 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+0x362/0x8f0 net/core/neighbour.c:996
 neigh_timer_handler+0xdc0/0x14c0 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

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x44/0x50 mm/kmsan/kmsan_instr.c:116
 skb_put_data include/linux/skbuff.h:2235 [inline]
 sctp_packet_pack net/sctp/output.c:470 [inline]
 sctp_packet_transmit+0x1dd1/0x4380 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:1786 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1189 [inline]
 sctp_do_sm+0x9105/0x9760 net/sctp/sm_sideeffect.c:1160
 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391
 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

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x44/0x50 mm/kmsan/kmsan_instr.c:116
 skb_put_data include/linux/skbuff.h:2235 [inline]
 sctp_addto_chunk+0x21c/0x430 net/sctp/sm_make_chunk.c:1494
 sctp_make_heartbeat+0x4eb/0x700 net/sctp/sm_make_chunk.c:1164
 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline]
 sctp_sf_sendbeat_8_3+0x18d/0xb10 net/sctp/sm_statefuns.c:1034
 sctp_do_sm+0x2b4/0x9760 net/sctp/sm_sideeffect.c:1157
 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391
 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

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x44/0x50 mm/kmsan/kmsan_instr.c:116
 sctp_make_heartbeat+0x3f7/0x700 net/sctp/sm_make_chunk.c:1156
 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline]
 sctp_sf_sendbeat_8_3+0x18d/0xb10 net/sctp/sm_statefuns.c:1034
 sctp_do_sm+0x2b4/0x9760 net/sctp/sm_sideeffect.c:1157
 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391
 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

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xc5/0x140 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x44/0x50 mm/kmsan/kmsan_instr.c:116
 sctp_transport_init net/sctp/transport.c:47 [inline]
 sctp_transport_new+0x248/0xa20 net/sctp/transport.c:100
 sctp_assoc_add_peer+0x5ba/0x2120 net/sctp/associola.c:617
 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+0x2b4/0x9760 net/sctp/sm_sideeffect.c:1157
 sctp_endpoint_bh_rcv+0xd99/0x1040 net/sctp/endpointola.c:395
 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:80
 sctp_rcv+0x4ba4/0x54b0 net/sctp/input.c:256
 ip_protocol_deliver_rcu+0x70f/0xbd0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:442 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_rcv+0x6cf/0x750 net/ipv4/ip_input.c:538
 __netif_receive_skb_one_core net/core/dev.c:5150 [inline]
 __netif_receive_skb net/core/dev.c:5264 [inline]
 process_backlog+0xece/0x13c0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6600
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293

Local variable ----addr.i@sctp_process_init 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
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