linux-kernel - Re: [PATCH] net: tipc: fix a missing check of nla_nest

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Message-ID: <1d97622a-6404-6600-c06b-9450b225742b@cogentembedded.com>
Date:   Fri, 15 Mar 2019 11:58:50 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: tipc: fix a missing check of nla_nest_start

Hello!

On 15.03.2019 9:07, Kangjie Lu wrote:

> nla_nest_start could fail and requires a check. The fix returns
> -EMSGSIZE if it fails.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>   net/tipc/group.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/net/tipc/group.c b/net/tipc/group.c
> index 06fee142f09f..117867e480ba 100644
> --- a/net/tipc/group.c
> +++ b/net/tipc/group.c
> @@ -918,6 +918,8 @@ void tipc_group_member_evt(struct tipc_group *grp,
>   int tipc_group_fill_sock_diag(struct tipc_group *grp, struct sk_buff *skb)
>   {
>   	struct nlattr *group = nla_nest_start(skb, TIPC_NLA_SOCK_GROUP);

    Please keep the empty line after the declarations.

> +	if (!group)
> +		return -EMSGSIZE;
>   
>   	if (nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_ID,
>   			grp->type) ||

MBR, Sergei