--- /dev/null
+Only in madwifi.dev/ath: if_ath.c.orig
+diff -ur madwifi.old/net80211/ieee80211_crypto_ccmp.c madwifi.dev/net80211/ieee80211_crypto_ccmp.c
+--- madwifi.old/net80211/ieee80211_crypto_ccmp.c 2007-06-02 04:37:47.425966000 +0200
++++ madwifi.dev/net80211/ieee80211_crypto_ccmp.c 2007-06-02 18:38:27.675882768 +0200
+@@ -465,6 +465,9 @@
+ uint8_t *mic, *pos;
+ u_int space;
+
++ if (ctx->cc_tfm == NULL)
++ return 0;
++
+ ctx->cc_vap->iv_stats.is_crypto_ccmp++;
+
+ skb = skb0;
+@@ -579,6 +582,9 @@
+ uint8_t *pos, *mic;
+ u_int space;
+
++ if (ctx->cc_tfm == NULL)
++ return 0;
++
+ ctx->cc_vap->iv_stats.is_crypto_ccmp++;
+
+ skb = skb0;