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cfg80211: fix channel check in cfg80211_can_use_iftype_chan

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In commit "cfg80211: check radar interface combinations" a regression
was introduced which might lead to NULL dereference if the argument
chan = NULL, which might happen in IBSS/wext case (and probably
others).

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Simon Wunderlich 2013-01-23 15:15:57 +01:00 committed by Johannes Berg
parent f68d776a04
commit 683d41ae67
1 changed files with 2 additions and 1 deletions
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3
net/wireless/util.c
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@ -1212,7 +1212,8 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_WDS:
radar_required = !!(chan->flags & IEEE80211_CHAN_RADAR);
radar_required = !!(chan &&
(chan->flags & IEEE80211_CHAN_RADAR));
break;
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_STATION: