openwrt/package/madwifi/patches/123-ccmp_checks.patch

--- a/net80211/ieee80211_crypto_ccmp.c
+++ b/net80211/ieee80211_crypto_ccmp.c
@@ -475,6 +475,9 @@ ccmp_encrypt(struct ieee80211_key *key, 
 	uint8_t *mic, *pos;
 	u_int space;
 
+	if (ctx->cc_tfm == NULL)
+		return 0;
+
 	ctx->cc_vap->iv_stats.is_crypto_ccmp++;
 
 	skb = skb0;
@@ -589,6 +592,9 @@ ccmp_decrypt(struct ieee80211_key *key, 
 	uint8_t *pos, *mic;
 	u_int space;
 
+	if (ctx->cc_tfm == NULL)
+		return 0;
+
 	ctx->cc_vap->iv_stats.is_crypto_ccmp++;
 
 	skb = skb0;