linux-kernel - Re: [PATCH] dccp: fix use-after-free after cloning struct dccp

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Message-Id: <20151222.153425.727988801786072877.davem@davemloft.net>
Date:	Tue, 22 Dec 2015 15:34:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	vegard.nossum@...cle.com
Cc:	acme@...nel.org, edumazet@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dccp: fix use-after-free after cloning struct dccp_sock

From: Vegard Nossum <vegard.nossum@...cle.com>
Date: Sun, 20 Dec 2015 21:53:27 +0100

> @@ -115,6 +115,10 @@ struct sock *dccp_create_openreq_child(const struct sock *sk,
>  		newdp->dccps_isr = dreq->dreq_isr;
>  		newdp->dccps_gsr = dreq->dreq_gsr;
>  
> +		newdp->dccps_hc_rx_ackvec = NULL;
> +		newdp->dccps_hc_rx_ccid = NULL;
> +		newdp->dccps_hc_tx_ccid = NULL;

->dccps_hc_rx_ackvec is set to NULL several lines above this, so you don't
need to add that case here.

WRT the ccid pointers, I don't think we can just NULL them out.

If the parent socket has these CCID features enabled, we have to
clone them into the child somehow.
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