netdev - Re: [PATCH net] net: netlink: Fix uninit-value in netlink

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Message-ID: <13b4ccb1-2dec-fc4d-b9da-0957240f7fd7@cogentembedded.com>
Date:   Fri, 6 Dec 2019 21:20:22 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Håkon Bugge <haakon.bugge@...cle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] net: netlink: Fix uninit-value in netlink_recvmsg()

Hello!

On 12/06/2019 04:49 PM, Håkon Bugge wrote:

> If skb_recv_datagram() returns NULL, netlink_recvmsg() will return an
> arbitrarily value.

   Arbitrary?

> Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
> ---
>  net/netlink/af_netlink.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
> index 90b2ab9dd449..bb7276f9c9f8 100644
> --- a/net/netlink/af_netlink.c
> +++ b/net/netlink/af_netlink.c
> @@ -1936,6 +1936,7 @@ static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
>  		return -EOPNOTSUPP;
>  
>  	copied = 0;
> +	err = 0;
>  
>  	skb = skb_recv_datagram(sk, flags, noblock, &err);
>  	if (skb == NULL)

MBR, Sergei