From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: kernel-janitors@vger.kernel.org, netdev@vger.kernel.org,
Patrick McHardy <kaber@trash.net>,
e1000-devel@lists.sourceforge.net,
Bruce Allan <bruce.w.allan@intel.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
"David S. Miller" <davem@davemloft.net>,
John Ronciak <john.ronciak@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [patch -stable] igbvf: integer wrapping bug setting the mtu
Date: Fri, 13 Sep 2013 08:37:36 +0000 [thread overview]
Message-ID: <20130913083736.GK19211@elgon.mountain> (raw)
If new_mtu is very large then "new_mtu + ETH_HLEN + ETH_FCS_LEN" can
wrap and the check on the next line can underflow. This is one of those
bugs which can be triggered by the user if you have namespaces
configured.
This is a static checker fix and I'm not sure what the impact is.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index 95d5430..24e3883 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2342,7 +2342,7 @@ static struct net_device_stats *igbvf_get_stats(struct net_device *netdev)
static int igbvf_change_mtu(struct net_device *netdev, int new_mtu)
{
struct igbvf_adapter *adapter = netdev_priv(netdev);
- int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
+ unsigned int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
if ((new_mtu < 68) || (max_frame > MAX_JUMBO_FRAME_SIZE)) {
dev_err(&adapter->pdev->dev, "Invalid MTU setting\n");
next reply other threads:[~2013-09-13 8:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-13 8:37 Dan Carpenter [this message]
2013-09-13 8:58 ` [patch -stable] igbvf: integer wrapping bug setting the mtu David Laight
2013-09-13 9:54 ` Dan Carpenter
2013-09-13 10:55 ` David Laight
2013-09-13 12:29 ` [patch v2 " Dan Carpenter
2013-09-13 12:39 ` Jeff Kirsher
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