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From: Ben Greear <greearb@candelatech.com>
To: Cong Ding <dinggnu@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>,
	"John W. Linville" <linville@tuxdriver.com>,
	"David S. Miller" <davem@davemloft.net>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: mac80211/cfg.c: fix error using of sizeof()
Date: Wed, 06 Feb 2013 09:58:18 -0800	[thread overview]
Message-ID: <511299BA.905@candelatech.com> (raw)
In-Reply-To: <1360167826-29265-1-git-send-email-dinggnu@gmail.com>

On 02/06/2013 08:23 AM, Cong Ding wrote:
> Using 'sizeof' on array given as function argument returns size of a pointer
> rather than the size of array.
>
> Signed-off-by: Cong Ding <dinggnu@gmail.com>
> ---
>   net/mac80211/cfg.c |    3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
> index 661b878..af561d5 100644
> --- a/net/mac80211/cfg.c
> +++ b/net/mac80211/cfg.c
> @@ -2058,7 +2058,8 @@ static int ieee80211_set_mcast_rate(struct wiphy *wiphy, struct net_device *dev,
>   {
>   	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
>
> -	memcpy(sdata->vif.bss_conf.mcast_rate, rate, sizeof(rate));
> +	memcpy(sdata->vif.bss_conf.mcast_rate, rate,
> +			sizeof(int) * IEEE80211_NUM_BANDS);

Should it perhaps be:  sizeof(*rate) * IEEE80211_NUM_BANDS
just in case the type ever changes?

Thanks,
Ben

>
>   	return 0;
>   }
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


WARNING: multiple messages have this Message-ID (diff)
From: Ben Greear <greearb-my8/4N5VtI7c+919tysfdA@public.gmane.org>
To: Cong Ding <dinggnu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>,
	"John W. Linville"
	<linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>,
	"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] net: mac80211/cfg.c: fix error using of sizeof()
Date: Wed, 06 Feb 2013 09:58:18 -0800	[thread overview]
Message-ID: <511299BA.905@candelatech.com> (raw)
In-Reply-To: <1360167826-29265-1-git-send-email-dinggnu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

On 02/06/2013 08:23 AM, Cong Ding wrote:
> Using 'sizeof' on array given as function argument returns size of a pointer
> rather than the size of array.
>
> Signed-off-by: Cong Ding <dinggnu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>   net/mac80211/cfg.c |    3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
> index 661b878..af561d5 100644
> --- a/net/mac80211/cfg.c
> +++ b/net/mac80211/cfg.c
> @@ -2058,7 +2058,8 @@ static int ieee80211_set_mcast_rate(struct wiphy *wiphy, struct net_device *dev,
>   {
>   	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
>
> -	memcpy(sdata->vif.bss_conf.mcast_rate, rate, sizeof(rate));
> +	memcpy(sdata->vif.bss_conf.mcast_rate, rate,
> +			sizeof(int) * IEEE80211_NUM_BANDS);

Should it perhaps be:  sizeof(*rate) * IEEE80211_NUM_BANDS
just in case the type ever changes?

Thanks,
Ben

>
>   	return 0;
>   }
>


-- 
Ben Greear <greearb-my8/4N5VtI7c+919tysfdA@public.gmane.org>
Candela Technologies Inc  http://www.candelatech.com

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  parent reply	other threads:[~2013-02-06 17:58 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-06 16:23 [PATCH] net: mac80211/cfg.c: fix error using of sizeof() Cong Ding
2013-02-06 16:27 ` Johannes Berg
2013-02-06 17:54   ` Ben Greear
2013-02-06 17:59     ` Ben Greear
2013-02-06 17:58 ` Ben Greear [this message]
2013-02-06 17:58   ` Ben Greear
2013-02-06 18:33 ` David Miller
2013-02-06 19:28   ` Johannes Berg

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