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authorPhil Sutter <phil.sutter@viprinet.com>2012-03-26 13:01:30 +0400
committerDavid S. Miller <davem@davemloft.net>2012-03-28 06:30:09 +0400
commit4eee6a3a04e8bb53fbe7de0f64d0524d3fbe3f80 (patch)
treef53517770ad3cda21d4689106e2ec3570c31f2be /drivers
parent7dd30d447b7f4a129586cce8e57d0163dde876b0 (diff)
downloadlinux-4eee6a3a04e8bb53fbe7de0f64d0524d3fbe3f80.tar.xz
wimax: i2400m - prevent a possible kernel bug due to missing fw_name string
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@viprinet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wimax/i2400m/netdev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/wimax/i2400m/netdev.c b/drivers/net/wimax/i2400m/netdev.c
index 63e4b709efa9..1d76ae855f07 100644
--- a/drivers/net/wimax/i2400m/netdev.c
+++ b/drivers/net/wimax/i2400m/netdev.c
@@ -597,7 +597,8 @@ 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);