================================================================== BUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x49a/0x850 net/sctp/ipv6.c:580 CPU: 0 PID: 6618 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #94 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1084 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 __sctp_v6_cmp_addr+0x49a/0x850 net/sctp/ipv6.c:580 sctp_inet6_cmp_addr+0x3dc/0x400 net/sctp/ipv6.c:898 sctp_bind_addr_match+0x18b/0x2f0 net/sctp/bind_addr.c:330 sctp_addrs_lookup_transport+0x904/0xa20 net/sctp/input.c:942 __sctp_lookup_association net/sctp/input.c:985 [inline] __sctp_rcv_lookup net/sctp/input.c:1249 [inline] sctp_rcv+0x15e6/0x4d30 net/sctp/input.c:170 ip_local_deliver_finish+0x874/0xec0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:288 [inline] ip_local_deliver+0x43c/0x4e0 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0xa36/0x1d00 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:288 [inline] ip_rcv+0x118f/0x16d0 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4592 __netif_receive_skb net/core/dev.c:4657 [inline] process_backlog+0x62d/0xe20 net/core/dev.c:5337 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x7c1/0x1a70 net/core/dev.c:5801 __do_softirq+0x56d/0x93d kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x114/0x140 kernel/softirq.c:182 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:728 [inline] ip_finish_output2+0x135a/0x1470 net/ipv4/ip_output.c:231 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_queue_xmit+0x1a1e/0x1d10 net/ipv4/ip_output.c:504 sctp_v4_xmit+0x188/0x210 net/sctp/protocol.c:983 sctp_packet_transmit+0x3eaa/0x4350 net/sctp/output.c:650 sctp_outq_flush+0x11e6/0x6320 net/sctp/outqueue.c:911 sctp_outq_uncork+0xd2/0xf0 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x8707/0x8d20 net/sctp/sm_sideeffect.c:1191 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:88 __sctp_connect+0x1655/0x1b00 net/sctp/socket.c:1247 sctp_connect+0x1b0/0x200 net/sctp/socket.c:4418 inet_dgram_connect+0x40c/0x670 net/ipv4/af_inet.c:571 __sys_connect+0x41a/0x510 net/socket.c:1665 __do_sys_connect net/socket.c:1676 [inline] __se_sys_connect net/socket.c:1673 [inline] __x64_sys_connect+0xd8/0x120 net/socket.c:1673 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a09 RSP: 002b:00007f2cd5af3c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f2cd5af46d4 RCX: 0000000000455a09 RDX: 000000000000001c RSI: 0000000020966fe4 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000005b R14: 00000000006f4928 R15: 0000000000000000 Local variable description: ----dest@sctp_rcv Variable was created at: sctp_rcv+0x13d/0x4d30 net/sctp/input.c:97 ip_local_deliver_finish+0x874/0xec0 net/ipv4/ip_input.c:215 ==================================================================