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BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32
CPU: 0 PID: 11424 Comm: syz-executor.1 Not tainted 5.0.0+ #16
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:636
 kmsan_internal_check_memory+0xaa1/0xbb0 mm/kmsan/kmsan.c:730
 kmsan_copy_to_user+0xab/0xc0 mm/kmsan/kmsan_hooks.c:485
 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32
 copy_to_user include/linux/uaccess.h:174 [inline]
 sctp_getsockopt_peer_addrs net/sctp/socket.c:5911 [inline]
 sctp_getsockopt+0x1668e/0x17f70 net/sctp/socket.c:7562
 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2950
 __sys_getsockopt+0x489/0x550 net/socket.c:1938
 __do_sys_getsockopt net/socket.c:1949 [inline]
 __se_sys_getsockopt+0xe1/0x100 net/socket.c:1946
 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1946
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x458209
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2ca285ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209
RDX: 000000000000006c RSI: 0000000000000084 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000020000040 R09: 0000000000000000
R10: 0000000020000240 R11: 0000000000000246 R12: 00007f2ca285b6d4
R13: 00000000004c96c8 R14: 00000000004d0310 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 sctp_getsockopt_peer_addrs net/sctp/socket.c:5906 [inline]
 sctp_getsockopt+0x16556/0x17f70 net/sctp/socket.c:7562
 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2950
 __sys_getsockopt+0x489/0x550 net/socket.c:1938
 __do_sys_getsockopt net/socket.c:1949 [inline]
 __se_sys_getsockopt+0xe1/0x100 net/socket.c:1946
 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1946
 do_syscall_64+0xbc/0xf0 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:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 sctp_transport_init net/sctp/transport.c:61 [inline]
 sctp_transport_new+0x16d/0x9a0 net/sctp/transport.c:115
 sctp_assoc_add_peer+0x532/0x1f70 net/sctp/associola.c:637
 sctp_process_param net/sctp/sm_make_chunk.c:2548 [inline]
 sctp_process_init+0x1a1b/0x3ed0 net/sctp/sm_make_chunk.c:2361
 sctp_cmd_process_init net/sctp/sm_sideeffect.c:682 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1410 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x3cfc/0x9af0 net/sctp/sm_sideeffect.c:1191
 sctp_assoc_bh_rcv+0x65a/0xd80 net/sctp/associola.c:1074
 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:95
 sctp_rcv+0x3c2f/0x54f0 net/sctp/input.c:271
 ip_protocol_deliver_rcu+0x584/0xbb0 net/ipv4/ip_input.c:208
 ip_local_deliver_finish net/ipv4/ip_input.c:234 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_local_deliver+0x624/0x7b0 net/ipv4/ip_input.c:255
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:414 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_rcv+0x6bd/0x740 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core net/core/dev.c:4973 [inline]
 __netif_receive_skb net/core/dev.c:5083 [inline]
 process_backlog+0x756/0x10e0 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x78b/0x1a60 net/core/dev.c:6412
 __do_softirq+0x53f/0x93a kernel/softirq.c:293

Local variable description: ----addr.i@sctp_process_init
Variable was created at:
 sctp_process_init+0xb5/0x3ed0 net/sctp/sm_make_chunk.c:2324
 sctp_cmd_process_init net/sctp/sm_sideeffect.c:682 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1410 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x3cfc/0x9af0 net/sctp/sm_sideeffect.c:1191

Bytes 8-15 of 16 are uninitialized
Memory access of size 16 starts at ffff88803a03fc28
Data copied to user address 0000000020000258
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