linux-kernel - [ 069/167] [PATCH 09/26] wimax: i2400m - prevent a possible kernel bug due to missing fw

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Date:	Wed, 09 May 2012 06:51:38 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Phil Sutter <phil.sutter@...rinet.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 069/167] [PATCH 09/26] wimax: i2400m - prevent a possible kernel bug due to
 missing fw_name string

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Phil Sutter <phil.sutter@...rinet.com>

[ Upstream commit 4eee6a3a04e8bb53fbe7de0f64d0524d3fbe3f80 ]

This happened on a machine with a custom hotplug script calling nameif,
probably due to slow firmware loading. At the time nameif uses ethtool
to gather interface information, i2400m->fw_name is zero and so a null
pointer dereference occurs from within i2400m_get_drvinfo().

Signed-off-by: Phil Sutter <phil.sutter@...rinet.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wimax/i2400m/netdev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wimax/i2400m/netdev.c b/drivers/net/wimax/i2400m/netdev.c
index 64a1106..4697cf3 100644
--- a/drivers/net/wimax/i2400m/netdev.c
+++ b/drivers/net/wimax/i2400m/netdev.c
@@ -607,7 +607,8 @@ static void i2400m_get_drvinfo(struct net_device *net_dev,
 	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
 
 	strncpy(info->driver, KBUILD_MODNAME, sizeof(info->driver) - 1);
-	strncpy(info->fw_version, i2400m->fw_name, sizeof(info->fw_version) - 1);
+	strncpy(info->fw_version,
+	        i2400m->fw_name ? : "", sizeof(info->fw_version) - 1);
 	if (net_dev->dev.parent)
 		strncpy(info->bus_info, dev_name(net_dev->dev.parent),
 			sizeof(info->bus_info) - 1);
-- 
1.7.10



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