mac80211: clear TX control on filtered frames

When an skb survived a round-trip through the driver
and needs to be re-used, its control information is
definitely not valid any more, the driver will have
overwritten it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 0ebcdda2420..9e171b17827 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -69,6 +69,14 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
          */
         goto drop;
 
+        /*
+         * This skb 'survived' a round-trip through the driver, and
+         * hopefully the driver didn't mangle it too badly. However,
+         * we can definitely not rely on the the control information
+         * being correct. Clear it so we don't get junk there.
+         */
+        memset(&info->control, 0, sizeof(info->control));
+
         sta->tx_filtered_count++;
 
         /*