linux-kernel - Re: [PATCH 1/1] net/wireless/util.c: replace memcpy by ether_addr

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Date:	Tue, 13 May 2014 15:05:40 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/1] net/wireless/util.c: replace memcpy by
 ether_addr_copy

On Mon, 2014-05-12 at 19:51 +0200, Fabian Frederick wrote:
> Cc: Johannes Berg <johannes@...solutions.net>
> Cc: "John W. Linville" <linville@...driver.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  net/wireless/util.c | 42 +++++++++++++++++++++---------------------
>  1 file changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index e5872ff..ab23b95 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
> @@ -381,8 +381,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
>  	 *   1     0   BSSID SA    DA    n/a
>  	 *   1     1   RA    TA    DA    SA
>  	 */
> -	memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
> -	memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
> +	ether_addr_copy(dst, ieee80211_get_DA(hdr));
> +	ether_addr_copy(src, ieee80211_get_SA(hdr));

I think this patch is mostly fine, but I'd like you to understand and
document (in the commit log) why it is, and fix the (potential future)
issue with "dst" as discussed in the other thread.

johannes

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