netdev - Re: [PATCH 1/5] net: ipv4: using strlcpy instead of strncpy

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Date:	Thu, 20 Jun 2013 05:14:57 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Zhao Hongjiang <zhaohongjiang@...wei.com>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] net: ipv4: using strlcpy instead of strncpy

On Thu, 2013-06-20 at 18:49 +0800, Zhao Hongjiang wrote:
> for NUL terminated string, need alway set '\0' in the end.
> 
> Signed-off-by: Zhao Hongjiang <zhaohongjiang@...wei.com>
> ---
>  net/ipv4/tcp_cong.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
> index 019c238..3280234 100644
> --- a/net/ipv4/tcp_cong.c
> +++ b/net/ipv4/tcp_cong.c
> @@ -170,7 +170,7 @@ void tcp_get_default_congestion_control(char *name)
>  
>  	rcu_read_lock();
>  	ca = list_entry(tcp_cong_list.next, struct tcp_congestion_ops, list);
> -	strncpy(name, ca->name, TCP_CA_NAME_MAX);
> +	strlcpy(name, ca->name, sizeof(name));
>  	rcu_read_unlock();
>  }
>  

You are quite mistaken.

How did you test this patch exactly ?



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