linux-kernel - Re: [PATCH net v1] net: ipv4: Use kfree

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Date:   Mon, 17 Jul 2023 11:48:03 -0700
From:   Kuniyuki Iwashima <kuniyu@...zon.com>
To:     <machel@...o.com>
CC:     <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
        <herbert@...dor.apana.org.au>, <kuba@...nel.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <opensource.kernel@...o.com>, <pabeni@...hat.com>,
        <steffen.klassert@...unet.com>, <kuniyu@...zon.com>
Subject: Re: [PATCH net v1] net: ipv4: Use kfree_sensitive instead of kfree

From: Wang Ming <machel@...o.com>
Date: Mon, 17 Jul 2023 17:59:19 +0800
> key might contain private part of the key, so better use
> kfree_sensitive to free it.
> 
> Fixes: 38320c70d282 ("[IPSEC]: Use crypto_aead and authenc in ESP")
> Signed-off-by: Wang Ming <machel@...o.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...zon.com>


> ---
>  net/ipv4/esp4.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
> index ba06ed42e428..2be2d4922557 100644
> --- a/net/ipv4/esp4.c
> +++ b/net/ipv4/esp4.c
> @@ -1132,7 +1132,7 @@ static int esp_init_authenc(struct xfrm_state *x,
>  	err = crypto_aead_setkey(aead, key, keylen);
>  
>  free_key:
> -	kfree(key);
> +	kfree_sensitive(key);
>  
>  error:
>  	return err;
> -- 
> 2.25.1