netdev - Re: [PATCH v1] net: wireless: Use kmemdup_array instead of kmemdup for multiple allocation

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Message-ID: <8316e533-241a-49ef-aac1-07ff01bf489f@wanadoo.fr>
Date: Wed, 21 Aug 2024 11:38:31 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Yu Jiaoliang <yujiaoliang@...o.com>,
 Johannes Berg <johannes@...solutions.net>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: Re: [PATCH v1] net: wireless: Use kmemdup_array instead of kmemdup
 for multiple allocation

Le 21/08/2024 à 09:24, Yu Jiaoliang a écrit :
> Let the kememdup_array() take care about multiplication and possible
> overflows.
> 
> Signed-off-by: Yu Jiaoliang <yujiaoliang@...o.com>
> ---
>   net/wireless/util.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index 9a7c3adc8a3b..6cf19dda5d2a 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
> @@ -2435,8 +2435,8 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
>   		if (params->num_different_channels > c->num_different_channels)
>   			continue;
>   
> -		limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
> -				 GFP_KERNEL);
> +		limits = kmemdup_array(c->limits, c->n_limits, sizeof(limits[0]),

Maybe sizeof(*limits) would be a more usual pattern?

CJ

> +				       GFP_KERNEL);
>   		if (!limits)
>   			return -ENOMEM;
>