netdev - Re: [PATCH net-next-2.6] net_sched: sch

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Date:	Wed, 26 Jan 2011 09:43:43 -0800
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: Re: [PATCH net-next-2.6] net_sched: sch_mqprio: dont leak kernel
 memory

On Wed, 2011-01-26 at 18:21 +0100, Eric Dumazet wrote:
> mqprio_dump() should make sure all fields of struct tc_mqprio_qopt are
> initialized.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: John Fastabend <john.r.fastabend@...el.com>
> ---
>  net/sched/sch_mqprio.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
> index fbc6f53..effd4ee 100644
> --- a/net/sched/sch_mqprio.c
> +++ b/net/sched/sch_mqprio.c
> @@ -215,7 +215,7 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
>  	struct net_device *dev = qdisc_dev(sch);
>  	struct mqprio_sched *priv = qdisc_priv(sch);
>  	unsigned char *b = skb_tail_pointer(skb);
> -	struct tc_mqprio_qopt opt;
> +	struct tc_mqprio_qopt opt = { 0 };

I think the best style to use memset so that any
possible struct padding is guaranteed to be zeroed.


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