diff mbox series

cfg80211: check wiphy driver existence for drvinfo report

Message ID 20200203105644.28875-1-sergey.matyukevich.os@quantenna.com (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series cfg80211: check wiphy driver existence for drvinfo report | expand

Commit Message

Sergey Matyukevich Feb. 3, 2020, 10:56 a.m. UTC 
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>
---
 net/wireless/ethtool.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/net/wireless/ethtool.c b/net/wireless/ethtool.c
index a9c0f368db5d..24e18405cdb4 100644
--- 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));