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SubjectKMSAN: uninit-value in __sctp_v6_cmp_addr
From
Hello,

syzbot found the following crash on:

HEAD commit: 74ee2200b89f kmsan: bump .config.example to v4.17-rc3
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=169efb5b800000
kernel config: https://syzkaller.appspot.com/x/.config?x=4ca1e57bafa8ab1f
dashboard link: https://syzkaller.appspot.com/bug?extid=85490c30c260afff22f2
compiler: clang version 7.0.0 (trunk 329391)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=157e9237800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fe5de7800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+85490c30c260afff22f2@syzkaller.appspotmail.com

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x49a/0x850
net/sctp/ipv6.c:580
CPU: 0 PID: 4453 Comm: syz-executor325 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__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:1067
__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
</IRQ>
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+0x1a7a/0x6320 net/sctp/outqueue.c:1197
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_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:200
sctp_apply_peer_addr_params+0x207/0x1670 net/sctp/socket.c:2487
sctp_setsockopt_peer_addr_params net/sctp/socket.c:2683 [inline]
sctp_setsockopt+0x10e5f/0x11600 net/sctp/socket.c:4258
sock_common_setsockopt+0x136/0x170 net/core/sock.c:3039
__sys_setsockopt+0x4af/0x560 net/socket.c:1903
__do_sys_setsockopt net/socket.c:1914 [inline]
__se_sys_setsockopt net/socket.c:1911 [inline]
__x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43fef9
RSP: 002b:00007ffc00d9bfd8 EFLAGS: 00000207 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fef9
RDX: 0000000000000009 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000098 R09: 000000000000001c
R10: 0000000020000180 R11: 0000000000000207 R12: 0000000000401820
R13: 00000000004018b0 R14: 0000000000000000 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
==================================================================


---
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