[ 069/167] [PATCH 09/26] wimax: i2400m - prevent a possible kernel bug due tomissing fw_name string
From: Ben Hutchings
Date: Wed May 09 2012 - 02:24:04 EST
3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Phil Sutter <phil.sutter@xxxxxxxxxxxx>
[ 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@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
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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