linux-kernel - Re: [PATCH v6 2/4] net: moxa: replace build_skb() with netdev_alloc_skb_ip

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Message-Id: <20140825.172604.1629510702830732700.davem@davemloft.net>
Date:	Mon, 25 Aug 2014 17:26:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jonas.jensen@...il.com
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, f.fainelli@...il.com,
	eric.dumazet@...il.com, mirqus@...il.com
Subject: Re: [PATCH v6 2/4] net: moxa: replace build_skb() with
 netdev_alloc_skb_ip_align() / memcpy()

From: Jonas Jensen <jonas.jensen@...il.com>
Date: Mon, 25 Aug 2014 16:22:22 +0200

> build_skb() is used to make skbs out of existing RX ring memory
> which is bad because the RX ring is allocated only once, on probe.
> Memory corruption occur because said memory is reclaimed, i.e.
> __kfree_skb() (and eventually put_page()).
> 
> Replace build_skb() with netdev_alloc_skb_ip_align() and use memcpy().
> 
> Remove SKB_DATA_ALIGN() from RX buffer size while we're at it.
> 
> Addresses https://bugzilla.kernel.org/show_bug.cgi?id=69041
> 
> Signed-off-by: Jonas Jensen <jonas.jensen@...il.com>

Applied.
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