Date:   Wed, 20 Mar 2019 14:22:05 -0700
From:   syzbot <syzbot+be4bdf2cc3e85e952c50@...kaller.appspotmail.com>
To:     davem@...emloft.net, hoang.h.le@...tech.com.au,
        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: general protection fault in tipc_mcast_filter_msg

Hello,

syzbot found the following crash on:

HEAD commit:    a0cfa79f ibmveth: Make array ibmveth_stats static
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17ec3ea3200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f05902bca21d8935
dashboard link: https://syzkaller.appspot.com/bug?extid=be4bdf2cc3e85e952c50
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=146929f7200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c05c6d200000

The bug was bisected to:

commit c55c8edafa91139419ed011f7d036274ce96be0b
Author: Hoang Le <hoang.h.le@...tech.com.au>
Date:   Tue Mar 19 11:49:50 2019 +0000

     tipc: smooth change between replicast and broadcast

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=173929f7200000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=14b929f7200000
console output: https://syzkaller.appspot.com/x/log.txt?x=10b929f7200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+be4bdf2cc3e85e952c50@...kaller.appspotmail.com
Fixes: c55c8eda ("tipc: smooth change between replicast and broadcast")

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7820 Comm: syz-executor418 Not tainted 5.0.0+ #61
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:tipc_mcast_filter_msg+0x21b/0x13d0 net/tipc/bcast.c:782
Code: 45 c0 0f 84 39 06 00 00 48 89 5d 98 e8 ce ab a5 fa 49 8d bc 24 c8 00  
00 00 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f  
85 9a 0e 00 00 49 8b 9c 24 c8 00 00 00 48 be 00 00
RSP: 0018:ffff8880959defc8 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffff888081258a48 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff86cab862 RDI: 00000000000000c8
RBP: ffff8880959df030 R08: ffff8880813d0200 R09: ffffed1015d05bc8
R10: ffffed1015d05bc7 R11: ffff8880ae82de3b R12: 0000000000000000
R13: 000000000000002c R14: 0000000000000000 R15: ffff888081258a48
FS:  000000000106a880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001cc0 CR3: 0000000094a20000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  tipc_sk_filter_rcv+0x182d/0x34f0 net/tipc/socket.c:2168
  tipc_sk_enqueue net/tipc/socket.c:2254 [inline]
  tipc_sk_rcv+0xc45/0x25a0 net/tipc/socket.c:2305
  tipc_sk_mcast_rcv+0x724/0x1020 net/tipc/socket.c:1209
  tipc_mcast_xmit+0x7fe/0x1200 net/tipc/bcast.c:410
  tipc_sendmcast+0xb36/0xfc0 net/tipc/socket.c:820
  __tipc_sendmsg+0x10df/0x18d0 net/tipc/socket.c:1358
  tipc_sendmsg+0x53/0x80 net/tipc/socket.c:1291
  sock_sendmsg_nosec net/socket.c:651 [inline]
  sock_sendmsg+0xdd/0x130 net/socket.c:661
  ___sys_sendmsg+0x806/0x930 net/socket.c:2260
  __sys_sendmsg+0x105/0x1d0 net/socket.c:2298
  __do_sys_sendmsg net/socket.c:2307 [inline]
  __se_sys_sendmsg net/socket.c:2305 [inline]
  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2305
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4401c9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd887fa9d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401c9
RDX: 0000000000000000 RSI: 0000000020002140 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a50
R13: 0000000000401ae0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace ba79875754e1708f ]---
RIP: 0010:tipc_mcast_filter_msg+0x21b/0x13d0 net/tipc/bcast.c:782
Code: 45 c0 0f 84 39 06 00 00 48 89 5d 98 e8 ce ab a5 fa 49 8d bc 24 c8 00  
00 00 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f  
85 9a 0e 00 00 49 8b 9c 24 c8 00 00 00 48 be 00 00
RSP: 0018:ffff8880959defc8 EFLAGS: 00010202
RAX: 0000000000000019 RBX: ffff888081258a48 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff86cab862 RDI: 00000000000000c8
RBP: ffff8880959df030 R08: ffff8880813d0200 R09: ffffed1015d05bc8
R10: ffffed1015d05bc7 R11: ffff8880ae82de3b R12: 0000000000000000
R13: 000000000000002c R14: 0000000000000000 R15: ffff888081258a48
FS:  000000000106a880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001cc0 CR3: 0000000094a20000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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