netdev - Re: [PATCH] net: mvneta: fix race condition in mvneta

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Message-ID: <1417523835.5303.41.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 02 Dec 2014 04:37:15 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	netdev@...r.kernel.org,
	Maggie Mae Roxas <maggie.mae.roxas@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Subject: Re: [PATCH] net: mvneta: fix race condition in mvneta_tx()

On Tue, 2014-12-02 at 04:30 -0800, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> mvneta_tx() dereferences skb to get skb->len too late,
> as hardware might have completed the transmit and TX completion
> could have freed the skb from another cpu.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>



For completeness, this bug was added in linux-3.14 and seems a stable
candidate.

Fixes: 71f6d1b31fb1 ("net: mvneta: replace Tx timer with a real interrupt")


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