mac80211: validate SIOCSIWPOWER arguments better

Don't accept any arguments we don't handle, and return error codes
instead of using an uninitialised stack value.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index 5690c3d41e7d..3fc1b903bfbc 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -853,9 +853,12 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
                 ps = true;
                 break;
         default:                /* Otherwise we ignore */
-                break;
+                return -EINVAL;
         }
 
+        if (wrq->flags & ~(IW_POWER_MODE | IW_POWER_TIMEOUT))
+                return -EINVAL;
+
         if (wrq->flags & IW_POWER_TIMEOUT)
                 timeout = wrq->value / 1000;