linux-kernel - Re: [PATCH] [PATCH net-next v2] net: stmmac: fix NULL pointer dereference in stmmac_get_tx

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Message-Id: <20140119.200352.719528361166763885.davem@davemloft.net>
Date:	Sun, 19 Jan 2014 20:03:52 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	damuzi000@...il.com
Cc:	peppe.cavallaro@...com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [PATCH net-next v2] net: stmmac: fix NULL pointer
 dereference in stmmac_get_tx_hwtstamp

From: Bruce Liu <damuzi000@...il.com>
Date: Fri, 17 Jan 2014 23:47:59 +0800

> 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@...il.com>

Looks a lot better, applied, thanks.
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