From 4eee6a3a04e8bb53fbe7de0f64d0524d3fbe3f80 Mon Sep 17 00:00:00 2001 From: Phil Sutter <phil.sutter@viprinet.com> Date: Mon, 26 Mar 2012 09:01:30 +0000 Subject: 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> --- drivers/net/wimax/i2400m/netdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/wimax') diff --git a/drivers/net/wimax/i2400m/netdev.c b/drivers/net/wimax/i2400m/netdev.c index 63e4b709efa..1d76ae855f0 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); -- cgit v1.2.2