From: Ben Hutchings <bhutchings@solarflare.com>
Date: Fri, 6 Dec 2013 19:26:40 +0000 (+0000)
Subject: sfc: Add length checks to efx_xmit_with_hwtstamp() and efx_ptp_is_ptp_tx()
X-Git-Tag: v3.13-rc4~3^2~32^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5a498e943fbc497f236ab8cf31366c75f337ce6;p=pandora-kernel.git

sfc: Add length checks to efx_xmit_with_hwtstamp() and efx_ptp_is_ptp_tx()

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')
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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