Re: [PATCH 3.12 40/77] sfc: Add length checks to efx_xmit_with_hwtstamp() and efx_ptp_is_ptp_tx()

[Luis Henriques <luis.henriques@canonical.com>]

On Tue, Jan 14, 2014 at 12:45:15AM +0000, Ben Hutchings wrote:
> On Mon, 2014-01-13 at 16:28 -0800, Greg Kroah-Hartman wrote:
> > 3.12-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Ben Hutchings <bhutchings@solarflare.com>
> > 
> > [ Upstream commit e5a498e943fbc497f236ab8cf31366c75f337ce6 ]
> > 
> > efx_ptp_is_ptp_tx() must be robust against skbs from raw sockets that
> > have invalid IPv4 and UDP headers.
> > 
> > Add checks that:
> > - the transport header has been found
> > - there is enough space between network and transport header offset
> >   for an IPv4 header
> > - there is enough space after the transport header offset for a
> >   UDP header
> > 
> > Fixes: 7c236c43b838 ('sfc: Add support for IEEE-1588 PTP')
> 
> All the PTP fixes for sfc (40-44 in this series) logically apply to
> 3.10.y as well.  David, did you find conflicts there?
> 
> Ben.

Thank you Ben, I am queuing these 5 commits for the 3.11 kernel.

Cheers,
--
Luis


> > Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
> > Signed-off-by: David S. Miller <davem@davemloft.net>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > ---
> >  drivers/net/ethernet/sfc/ptp.c |    4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > --- a/drivers/net/ethernet/sfc/ptp.c
> > +++ b/drivers/net/ethernet/sfc/ptp.c
> > @@ -989,7 +989,11 @@ bool efx_ptp_is_ptp_tx(struct efx_nic *e
> >  		skb->len >= PTP_MIN_LENGTH &&
> >  		skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM &&
> >  		likely(skb->protocol == htons(ETH_P_IP)) &&
> > +		skb_transport_header_was_set(skb) &&
> > +		skb_network_header_len(skb) >= sizeof(struct iphdr) &&
> >  		ip_hdr(skb)->protocol == IPPROTO_UDP &&
> > +		skb_headlen(skb) >=
> > +		skb_transport_offset(skb) + sizeof(struct udphdr) &&
> >  		udp_hdr(skb)->dest == htons(PTP_EVENT_PORT);
> >  }
> >  
> > 
> > 
> 
> -- 
> Ben Hutchings, Staff Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
> 
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