linux-kernel - KMSAN: uninit-value in tipc_conn_rcv

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Message-ID: <0000000000001f5921056c18fe1a@google.com>
Date:   Sun, 13 May 2018 09:38:02 -0700
From:   syzbot <syzbot+8951a3065ee7fd6d6e23@...kaller.appspotmail.com>
To:     davem@...emloft.net, jon.maloy@...csson.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: KMSAN: uninit-value in tipc_conn_rcv_sub

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=12ab8637800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4ca1e57bafa8ab1f
dashboard link: https://syzkaller.appspot.com/bug?extid=8951a3065ee7fd6d6e23
compiler:       clang version 7.0.0 (trunk 329391)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15a497f7800000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177c1907800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8951a3065ee7fd6d6e23@...kaller.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 tipc_conn_rcv_sub+0x184/0x950  
net/tipc/topsrv.c:373
CPU: 0 PID: 66 Comm: kworker/u4:4 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: tipc_rcv tipc_conn_recv_work
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:1067
  __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
  tipc_conn_rcv_sub+0x184/0x950 net/tipc/topsrv.c:373
  tipc_conn_rcv_from_sock net/tipc/topsrv.c:409 [inline]
  tipc_conn_recv_work+0x3cd/0x560 net/tipc/topsrv.c:424
  process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145
  worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279
  kthread+0x539/0x720 kernel/kthread.c:239
  ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412

Local variable description: ----s.i@...c_conn_recv_work
Variable was created at:
  tipc_conn_recv_work+0x65/0x560 net/tipc/topsrv.c:419
  process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 66 Comm: kworker/u4:4 Tainted: G    B             4.17.0-rc3+  
#88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: tipc_rcv tipc_conn_recv_work
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x185/0x1d0 lib/dump_stack.c:113
  panic+0x39d/0x940 kernel/panic.c:184
  kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083
  __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
  tipc_conn_rcv_sub+0x184/0x950 net/tipc/topsrv.c:373
  tipc_conn_rcv_from_sock net/tipc/topsrv.c:409 [inline]
  tipc_conn_recv_work+0x3cd/0x560 net/tipc/topsrv.c:424
  process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145
  worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279
  kthread+0x539/0x720 kernel/kthread.c:239
  ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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