cfg80211: check wiphy driver existence for drvinfo report

[ Upstream commit bfb7bac3a8f47100ebe7961bd14e924c96e21ca7 ]

When preparing ethtool drvinfo, check if wiphy driver is defined
before dereferencing it. Driver may not exist, e.g. if wiphy is
attached to a virtual platform device.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Link: https://lore.kernel.org/r/20200203105644.28875-1-sergey.matyukevich.os@quantenna.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/wireless/ethtool.c b/net/wireless/ethtool.c
index a9c0f36..24e1840 100644 (file)
--- a/net/wireless/ethtool.c
+++ b/net/wireless/ethtool.c
@@ -7,9 +7,13 @@
 void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 {
        struct wireless_dev *wdev = dev->ieee80211_ptr;
+       struct device *pdev = wiphy_dev(wdev->wiphy);
 
-       strlcpy(info->driver, wiphy_dev(wdev->wiphy)->driver->name,
-               sizeof(info->driver));
+       if (pdev->driver)
+               strlcpy(info->driver, pdev->driver->name,
+                       sizeof(info->driver));
+       else
+               strlcpy(info->driver, "N/A", sizeof(info->driver));
 
        strlcpy(info->version, init_utsname()->release, sizeof(info->version));