netdev - Re: [PATCH net] net: tls: prevent false connection termination with offload

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Date:   Thu, 28 Mar 2019 15:01:32 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        borisp@...lanox.com, davejwatson@...com, vakul.garg@....com,
        Simon Horman <simon.horman@...ronome.com>
Subject: Re: [PATCH net] net: tls: prevent false connection termination with
 offload

On Thu, 28 Mar 2019 14:54:43 -0700, Jakub Kicinski wrote:
> Only decrypt_internal() performs zero copy on rx, all paths
> which don't hit decrypt_internal() must set zc to false,
> otherwise tls_sw_recvmsg() may return 0 causing the application
> to believe that that connection got closed.
> 
> Currently this happens with device offload when new record
> is first read from.
> 
> Fixes: d069b780e367 ("tls: Fix tls_device receive")

Reported-by: David Beckett <david.beckett@...ronome.com>

> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Simon Horman <simon.horman@...ronome.com>
> ---
>  net/tls/tls_sw.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
> index 4f821edeeae6..4741edf4bb1e 100644
> --- a/net/tls/tls_sw.c
> +++ b/net/tls/tls_sw.c
> @@ -1497,6 +1497,8 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
>  
>  				return err;
>  			}
> +		} else {
> +			*zc = false;
>  		}
>  
>  		rxm->full_len -= padding_length(ctx, tls_ctx, skb);