linux-kernel - general protection fault in team_nl_cmd_options

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Date:   Wed, 06 Feb 2019 13:03:03 -0800
From:   syzbot <syzbot+68ee510075cf64260cc4@...kaller.appspotmail.com>
To:     davem@...emloft.net, jiri@...nulli.us,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: general protection fault in team_nl_cmd_options_set

Hello,

syzbot found the following crash on:

HEAD commit:    9097a058d49e Merge branch 'i2c/for-current' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11995667400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=861a3573f4e78ba1
dashboard link: https://syzkaller.appspot.com/bug?extid=68ee510075cf64260cc4
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1263c10d400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=130855b7400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+68ee510075cf64260cc4@...kaller.appspotmail.com

netlink: 'syz-executor043': attribute type 3 has an invalid length.
netlink: 'syz-executor043': attribute type 3 has an invalid length.
team0: Mode changed to "activebackup"
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: 1 PID: 6431 Comm: syz-executor043 Not tainted 4.20.0-rc7+ #161
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__team_option_inst_tmp_find drivers/net/team/team.c:264 [inline]
RIP: 0010:team_nl_cmd_options_set+0xa2d/0x1370 drivers/net/team/team.c:2591
Code: 8b 74 24 38 75 13 e9 eb 05 00 00 e8 4d 27 e0 fc 49 39 dc 0f 84 dd 05  
00 00 e8 3f 27 e0 fc 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00  
0f 85 af 06 00 00 49 8b 44 24 10 4c 8d 60 f0 49 39
RSP: 0018:ffff8881af967270 EFLAGS: 00010203
RAX: 000000060dac2cae RBX: ffff8881d189dc00 RCX: ffffffff849f5cb7
RDX: 0000000000000000 RSI: ffffffff849f5d31 RDI: 000000306d616574
RBP: ffff8881af9674d0 R08: ffff8881cc646080 R09: ffffed103b5e5020
R10: ffffed103b5e5020 R11: ffff8881daf28107 R12: 000000306d616564
R13: ffff8881d189de10 R14: ffff8881af967360 R15: dffffc0000000000
FS:  00007fad37cf4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d1810 CR3: 00000001b96af000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  genl_family_rcv_msg+0x8a7/0x11a0 net/netlink/genetlink.c:601
  genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626
  netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477
  genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
  netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
  netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336
  netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg+0xd5/0x120 net/socket.c:631
  ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
  __sys_sendmsg+0x11d/0x280 net/socket.c:2154
  __do_sys_sendmsg net/socket.c:2163 [inline]
  __se_sys_sendmsg net/socket.c:2161 [inline]
  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44de49
Code: e8 1c ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 c5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fad37cf3d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006e0c5c RCX: 000000000044de49
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00000000006e0c50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000006c61767265
R13: 746e695f6e696f6a R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace da19b5a20e6fec24 ]---
RIP: 0010:__team_option_inst_tmp_find drivers/net/team/team.c:264 [inline]
RIP: 0010:team_nl_cmd_options_set+0xa2d/0x1370 drivers/net/team/team.c:2591
Code: 8b 74 24 38 75 13 e9 eb 05 00 00 e8 4d 27 e0 fc 49 39 dc 0f 84 dd 05  
00 00 e8 3f 27 e0 fc 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00  
0f 85 af 06 00 00 49 8b 44 24 10 4c 8d 60 f0 49 39
RSP: 0018:ffff8881af967270 EFLAGS: 00010203
RAX: 000000060dac2cae RBX: ffff8881d189dc00 RCX: ffffffff849f5cb7
RDX: 0000000000000000 RSI: ffffffff849f5d31 RDI: 000000306d616574
RBP: ffff8881af9674d0 R08: ffff8881cc646080 R09: ffffed103b5e5020
R10: ffffed103b5e5020 R11: ffff8881daf28107 R12: 000000306d616564
R13: ffff8881d189de10 R14: ffff8881af967360 R15: dffffc0000000000
FS:  00007fad37cf4700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d1810 CR3: 00000001b96af000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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