[ 06/20] cfg80211: fix interface combinations check

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3.0-stable review patch.  If anyone has any objections, please let me know.


From: Johannes Berg <johannes.berg@xxxxxxxxx>

commit 463454b5dbd8dbab6e2fc6c557329e5b811b9c32 upstream.

If a given interface combination doesn't contain
a required interface type then we missed checking
that and erroneously allowed it even though iface
type wasn't there at all. Add a check that makes
sure that all interface types are accounted for.

Reported-by: Mohammed Shafi Shajakhan <mohammed@xxxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

 net/wireless/util.c |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -937,6 +937,7 @@ int cfg80211_can_change_interface(struct
 				  enum nl80211_iftype iftype)
 	struct wireless_dev *wdev_iter;
+	u32 used_iftypes = BIT(iftype);
 	int num[NUM_NL80211_IFTYPES];
 	int total = 1;
 	int i, j;
@@ -970,12 +971,14 @@ int cfg80211_can_change_interface(struct
+		used_iftypes |= BIT(wdev_iter->iftype);
 	for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
 		const struct ieee80211_iface_combination *c;
 		struct ieee80211_iface_limit *limits;
+		u32 all_iftypes = 0;
 		c = &rdev->wiphy.iface_combinations[i];
@@ -990,6 +993,7 @@ int cfg80211_can_change_interface(struct
 			if (rdev->wiphy.software_iftypes & BIT(iftype))
 			for (j = 0; j < c->n_limits; j++) {
+				all_iftypes |= limits[j].types;
 				if (!(limits[j].types & BIT(iftype)))
 				if (limits[j].max < num[iftype])
@@ -997,7 +1001,20 @@ int cfg80211_can_change_interface(struct
 				limits[j].max -= num[iftype];
-		/* yay, it fits */
+		/*
+		 * Finally check that all iftypes that we're currently
+		 * using are actually part of this combination. If they
+		 * aren't then we can't use this combination and have
+		 * to continue to the next.
+		 */
+		if ((all_iftypes & used_iftypes) != used_iftypes)
+			goto cont;
+		/*
+		 * This combination covered all interface types and
+		 * supported the requested numbers, so we're good.
+		 */
 		return 0;

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