From: damuzi000 <damuzi000@gmail.com>
Date: Fri, 17 Jan 2014 15:47:59 +0000 (+0800)
Subject: net: stmmac: fix NULL pointer dereference in stmmac_get_tx_hwtstamp
X-Git-Tag: v3.14-rc1~94^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75e4364f67d9cb996f9a6ff982ad9b3700648591;p=pandora-kernel.git

net: stmmac: fix NULL pointer dereference in stmmac_get_tx_hwtstamp

When timestamping is enabled, stmmac_tx_clean will call
stmmac_get_tx_hwtstamp to get tx TS.
But the skb can be NULL because the last of its tx_skbuff is NULL
if this packet frame is filled in more than one descriptors.

To fix the issue, change the code:
- Store TX skb to the tx_skbuff[] of frame's last segment.
- Check skb is not NULL in stmmac_get_tx_hwtstamp.

Signed-off-by: Bruce Liu <damuzi000@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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