[Xenial][PATCH 1/2] net/wireless: do not dereference invalid pointer

[Wen-chien Jesse Sung]

BugLink: https://launchpad.net/bugs/1712746

The wiphy may be NULL sometimes. Do not dereference when it's NULL.

Signed-off-by: Wen-chien Jesse Sung <jesse.sung at canonical.com>
---
 net/wireless/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index baf7218..e358511 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -121,7 +121,7 @@ struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
 	int i;
 
 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
-		sband = wiphy->bands[band];
+		sband = wiphy ? wiphy->bands[band] : NULL;
 
 		if (!sband)
 			continue;
-- 
2.7.4