Re: Please cherry-pick 5edabca9d4cf (CVE-2017-6074) for all stable kernels

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Feb 23, 2017 at 06:35:04PM +0100, Thomas Deutschmann wrote:
> Hi,
> 
> haven't seen commit
> 
> > From 5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4 Mon Sep 17 00:00:00 2001
> > From: Andrey Konovalov <andreyknvl@google.com>
> > Date: Thu, 16 Feb 2017 17:22:46 +0100
> > Subject: dccp: fix freeing skb too early for IPV6_RECVPKTINFO
> > 
> > In the current DCCP implementation an skb for a DCCP_PKT_REQUEST packet
> > is forcibly freed via __kfree_skb in dccp_rcv_state_process if
> > dccp_v6_conn_request successfully returns.
> > 
> > However, if IPV6_RECVPKTINFO is set on a socket, the address of the skb
> > is saved to ireq->pktopts and the ref count for skb is incremented in
> > dccp_v6_conn_request, so skb is still in use. Nevertheless, it gets freed
> > in dccp_rcv_state_process.
> > 
> > Fix by calling consume_skb instead of doing goto discard and therefore
> > calling __kfree_skb.
> > 
> > Similar fixes for TCP:
> > 
> > fb7e2399ec17f1004c0e0ccfd17439f8759ede01 [TCP]: skb is unexpectedly freed.
> > 0aea76d35c9651d55bbaf746e7914e5f9ae5a25d tcp: SYN packets are now
> > simply consumed
> > 
> > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > Acked-by: Eric Dumazet <edumazet@google.com>
> > Signed-off-by: David S. Miller <davem@davemloft.net>
> 
> in recent LTS kernel releases (3.2.85, 3.16.40, 4.4.51, 4.9.12...) nor
> found any information that this patch is queued.

That's because it was released after those kernels were under review :)

Also, networking patches for stable trees come from the networking
maintainer, you can always check:
	http://patchwork.ozlabs.org/bundle/davem/stable/?submitter=&state=*&q=&archive=

to see what has been marked to be sent for stable kernels.

Hope this helps,

greg k-h