netdev - Re: [PATCH net-next] net: propagate errors correctly in register

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Message-ID: <20191003191858.GA2369@nanopsycho>
Date:   Thu, 3 Oct 2019 21:18:58 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        syzbot <syzkaller@...glegroups.com>
Subject: Re: [PATCH net-next] net: propagate errors correctly in
 register_netdevice()

Thu, Oct 03, 2019 at 05:59:24PM CEST, edumazet@...gle.com wrote:
>If netdev_name_node_head_alloc() fails to allocate
>memory, we absolutely want register_netdevice() to return
>-ENOMEM instead of zero :/

oops.


>
>One of the syzbot report looked like :
>
>general protection fault: 0000 [#1] PREEMPT SMP KASAN
>CPU: 1 PID: 8760 Comm: syz-executor839 Not tainted 5.3.0+ #0
>Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>RIP: 0010:ovs_vport_add+0x185/0x500 net/openvswitch/vport.c:205
>Code: 89 c6 e8 3e b6 3a fa 49 81 fc 00 f0 ff ff 0f 87 6d 02 00 00 e8 8c b4 3a fa 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 d3 02 00 00 49 8d 7c 24 08 49 8b 34 24 48 b8 00
>RSP: 0018:ffff88808fe5f4e0 EFLAGS: 00010247
>RAX: dffffc0000000000 RBX: ffffffff89be8820 RCX: ffffffff87385162
>RDX: 0000000000000000 RSI: ffffffff87385174 RDI: 0000000000000007
>RBP: ffff88808fe5f510 R08: ffff8880933c6600 R09: fffffbfff14ee13c
>R10: fffffbfff14ee13b R11: ffffffff8a7709df R12: 0000000000000004
>R13: ffffffff89be8850 R14: ffff88808fe5f5e0 R15: 0000000000000002
>FS:  0000000001d71880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
>CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>CR2: 0000000020000280 CR3: 0000000096e4c000 CR4: 00000000001406e0
>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>Call Trace:
> new_vport+0x1b/0x1d0 net/openvswitch/datapath.c:194
> ovs_dp_cmd_new+0x5e5/0xe30 net/openvswitch/datapath.c:1644
> genl_family_rcv_msg+0x74b/0xf90 net/netlink/genetlink.c:629
> genl_rcv_msg+0xca/0x170 net/netlink/genetlink.c:654
> netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
> genl_rcv+0x29/0x40 net/netlink/genetlink.c:665
> netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
> netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
> netlink_sendmsg+0x8a5/0xd60 net/netlink/af_netlink.c:1917
> sock_sendmsg_nosec net/socket.c:637 [inline]
> sock_sendmsg+0xd7/0x130 net/socket.c:657
> ___sys_sendmsg+0x803/0x920 net/socket.c:2311
> __sys_sendmsg+0x105/0x1d0 net/socket.c:2356
> __do_sys_sendmsg net/socket.c:2365 [inline]
> __se_sys_sendmsg net/socket.c:2363 [inline]
> __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2363
>
>Fixes: ff92741270bf ("net: introduce name_node struct to be used in hashlist")
>Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>Cc: Jiri Pirko <jiri@...lanox.com>
>Reported-by: syzbot <syzkaller@...glegroups.com>

Reviewed-by: Jiri Pirko <jiri@...lanox.com>

Thanks!