cfg80211: fix crash in cfg80211_set_freq()

Since wdev can be NULL, check it before dereferencing it

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index d92d088..b01a6f6 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -50,7 +50,7 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
        struct ieee80211_channel *chan;
        int result;
 
-       if (wdev->iftype == NL80211_IFTYPE_MONITOR)
+       if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR)
                wdev = NULL;
 
        if (wdev) {