linux-kernel - Re: [PATCH net] xfrm: Fix xfrm sel prefix length validation

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Date:   Tue, 21 May 2019 20:22:38 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Anirudh Gupta <anirudhrudr@...il.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Anirudh Gupta <anirudh.gupta@...hos.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] xfrm: Fix xfrm sel prefix length validation

On Tue, May 21, 2019 at 01:52:47PM +0530, Anirudh Gupta wrote:
> Family of src/dst can be different from family of selector src/dst.
> Use xfrm selector family to validate address prefix length,
> while verifying new sa from userspace.
> 
> Validated patch with this command:
> ip xfrm state add src 1.1.6.1 dst 1.1.6.2 proto esp spi 4260196 \
> reqid 20004 mode tunnel aead "rfc4106(gcm(aes))" \
> 0x1111016400000000000000000000000044440001 128 \
> sel src 1011:1:4::2/128 sel dst 1021:1:4::2/128 dev Port5
> 
> Fixes: 07bf7908950a ("xfrm: Validate address prefix lengths in the xfrm selector.")
> Signed-off-by: Anirudh Gupta <anirudh.gupta@...hos.com>
> ---
>  net/xfrm/xfrm_user.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
> index eb8d14389601..1d1fe2208ab5 100644
> --- a/net/xfrm/xfrm_user.c
> +++ b/net/xfrm/xfrm_user.c
> @@ -150,6 +150,23 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
>  
>  	err = -EINVAL;
>  	switch (p->family) {
> +	case AF_INET:
> +		break;
> +
> +	case AF_INET6:
> +#if IS_ENABLED(CONFIG_IPV6)
> +		break;
> +#else
> +		err = -EAFNOSUPPORT;
> +		goto out;
> +#endif
> +
> +	default:
> +		goto out;
> +	}
> +
> +	err = -EINVAL;

This is not needed because you already set it at the start.

Otherwise this looks good to me.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt