netdev - Re: [PATCH] macvtap: fix TUNSETSNDBUF values

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Date:	Sun, 20 Sep 2015 22:45:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	linux-kernel@...r.kernel.org, mjrosato@...ux.vnet.ibm.com,
	borntraeger@...ibm.com, viro@...iv.linux.org.uk,
	jasowang@...hat.com, david@...son.dropbear.id.au,
	gkurz@...ux.vnet.ibm.com, vyasevich@...il.com, justin@...iabit.com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH] macvtap: fix TUNSETSNDBUF values > 64k

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Fri, 18 Sep 2015 13:41:09 +0300

> Upon TUNSETSNDBUF,  macvtap reads the requested sndbuf size into
> a local variable u.
> commit 39ec7de7092b ("macvtap: fix uninitialized access on
> TUNSETIFF") changed its type to u16 (which is the right thing to
> do for all other macvtap ioctls), breaking all values > 64k.
> 
> The value of TUNSETSNDBUF is actually a signed 32 bit integer, so
> the right thing to do is to read it into an int.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Fixes: 39ec7de7092b ("macvtap: fix uninitialized access on TUNSETIFF")
> Reported-by: Mark A. Peloquin
> Bisected-by: Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Applied and queued up for -stable, thanks.
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