ath9k: add some extra checks to the mic failure fix

SVN-Revision: 22825

package/mac80211/patches/570-ath9k_mic_failure_fix.patch

@@ -44,7 +44,7 @@
  EXPORT_SYMBOL(ath9k_cmn_key_delete);
 --- a/drivers/net/wireless/ath/ath9k/recv.c
 +++ b/drivers/net/wireless/ath/ath9k/recv.c
-@@ -870,15 +870,19 @@ static bool ath9k_rx_accept(struct ath_c
+@@ -870,15 +870,18 @@ static bool ath9k_rx_accept(struct ath_c
  		if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
  			*decrypt_error = true;
  		} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
@@ -58,17 +58,28 @@
 -			else
 +			/*
 +			 * The MIC error bit is only valid if the frame
-+			 * is not a control frame, and it was decrypted using
-+			 * a TKIP key.
++			 * is not a control frame or fragment, and it was
++			 * decrypted using a valid TKIP key.
 +			 */
 +			if (!ieee80211_is_ctl(fc) &&
-+			    rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
-+			    test_bit(rx_stats->rs_keyix, common->tkip_keymap)) {
++			    !ieee80211_has_morefrags(fc) &&
++			    !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
++			    test_bit(rx_stats->rs_keyix, common->tkip_keymap))
  				rxs->flag |= RX_FLAG_MMIC_ERROR;
-+			} else {
++			else
 +				rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
-+				*decrypt_error = true;
-+			}
  		}
  		/*
  		 * Reject error frames with the exception of
+--- a/drivers/net/wireless/ath/ath9k/mac.c
++++ b/drivers/net/wireless/ath/ath9k/mac.c
+@@ -711,7 +711,8 @@ int ath9k_hw_rxprocdesc(struct ath_hw *a
+ 			rs->rs_phyerr = phyerr;
+ 		} else if (ads.ds_rxstatus8 & AR_DecryptCRCErr)
+ 			rs->rs_status |= ATH9K_RXERR_DECRYPT;
+-		else if (ads.ds_rxstatus8 & AR_MichaelErr)
++		else if ((ads.ds_rxstatus8 & AR_MichaelErr) &&
++		         rs->rs_keyix != ATH9K_RXKEYIX_INVALID)
+ 			rs->rs_status |= ATH9K_RXERR_MIC;
+ 		else if (ads.ds_rxstatus8 & AR_KeyMiss)
+ 			rs->rs_status |= ATH9K_RXERR_DECRYPT;