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BUG: KMSAN: uninit-value in sctp_sockaddr_af net/sctp/socket.c:359 [inline]
BUG: KMSAN: uninit-value in sctp_verify_addr net/sctp/socket.c:227 [inline]
BUG: KMSAN: uninit-value in sctp_sendmsg+0x1ced/0x6020 net/sctp/socket.c:1660
CPU: 1 PID: 5851 Comm: syz-executor6 Not tainted 4.16.0+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 sctp_sockaddr_af net/sctp/socket.c:359 [inline]
 sctp_verify_addr net/sctp/socket.c:227 [inline]
 sctp_sendmsg+0x1ced/0x6020 net/sctp/socket.c:1660
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455329
RSP: 002b:00007f8450290c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f84502916d4 RCX: 0000000000455329
RDX: 0000000000000006 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 00000000206f9000 R09: 0000000000000010
R10: 0000000024000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f8 R14: 00000000006fa7e0 R15: 0000000000000000

Local variable description: ----address@SYSC_sendto
Variable was created at:
 SYSC_sendto+0xb8/0x7e0 net/socket.c:1718
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
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