netdev - Re: [PATCH v2] af_key: Fix heap information leak

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Date:   Thu, 9 Feb 2023 14:52:20 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     Hyunwoo Kim <v4bel@...ori.io>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        steffen.klassert@...unet.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        imv4bel@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] af_key: Fix heap information leak

2023-02-09, 01:16:48 -0800, Hyunwoo Kim wrote:
> Since x->encap of pfkey_msg2xfrm_state() is not
> initialized to 0, kernel heap data can be leaked.
> 
> Fix with kzalloc() to prevent this.
> 
> Signed-off-by: Hyunwoo Kim <v4bel@...ori.io>
> Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Reviewed-by: Sabrina Dubroca <sd@...asysnail.net>

Thanks.

> ---
>  net/key/af_key.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/key/af_key.c b/net/key/af_key.c
> index 2bdbcec781cd..a815f5ab4c49 100644
> --- a/net/key/af_key.c
> +++ b/net/key/af_key.c
> @@ -1261,7 +1261,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
>  		const struct sadb_x_nat_t_type* n_type;
>  		struct xfrm_encap_tmpl *natt;
>  
> -		x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
> +		x->encap = kzalloc(sizeof(*x->encap), GFP_KERNEL);
>  		if (!x->encap) {
>  			err = -ENOMEM;
>  			goto out;
> -- 
> 2.25.1
> 

-- 
Sabrina