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ath9k: fix decrypt_error initialization in ath_rx_tasklet()

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ath_rx_tasklet() calls ath9k_rx_skb_preprocess() and ath9k_rx_skb_postprocess()
in a loop over the received frames. The decrypt_error flag is
initialized to false
just outside ath_rx_tasklet() loop. ath9k_rx_accept(), called by
ath9k_rx_skb_preprocess(),
only sets decrypt_error to true and never to false.
Then ath_rx_tasklet() calls ath9k_rx_skb_postprocess() and passes
decrypt_error to it.
So, after a decryption error, in ath9k_rx_skb_postprocess(), we can
have a leftover value
from another processed frame. In that case, the frame will not be marked with
RX_FLAG_DECRYPTED even if it is decrypted correctly.
When using CCMP encryption this issue can lead to connection stuck
because of CCMP
PN corruption and a waste of CPU time since mac80211 tries to decrypt an already
deciphered frame with ieee80211_aes_ccm_decrypt.
Fix the issue initializing decrypt_error flag at the begging of the
ath_rx_tasklet() loop.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Lorenzo Bianconi 2012-08-10 11:00:24 +02:00 committed by John W. Linville
parent e19f15ac64
commit e1352fde56
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/ath/ath9k/recv.c
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@ -1044,7 +1044,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
struct ieee80211_hw *hw = sc->hw;
struct ieee80211_hdr *hdr;
int retval;
bool decrypt_error = false;
struct ath_rx_status rs;
enum ath9k_rx_qtype qtype;
bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
@ -1066,6 +1065,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
tsf_lower = tsf & 0xffffffff;
do {
bool decrypt_error = false;
/* If handling rx interrupt and flush is in progress => exit */
if (test_bit(SC_OP_RXFLUSH, &sc->sc_flags) && (flush == 0))
break;