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wimax: i2400m - prevent a possible kernel bug due to missing fw_name string

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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>
This commit is contained in:
Phil Sutter 2012-03-26 09:01:30 +00:00 committed by David S. Miller
parent 7dd30d447b
commit 4eee6a3a04
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wimax/i2400m/netdev.c
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@ -597,7 +597,8 @@ static void i2400m_get_drvinfo(struct net_device *net_dev,
struct i2400m *i2400m = net_dev_to_i2400m(net_dev); struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
strncpy(info->driver, KBUILD_MODNAME, sizeof(info->driver) - 1); 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) if (net_dev->dev.parent)
strncpy(info->bus_info, dev_name(net_dev->dev.parent), strncpy(info->bus_info, dev_name(net_dev->dev.parent),
sizeof(info->bus_info) - 1); sizeof(info->bus_info) - 1);