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| author | Shanyu Zhao <shanyu.zhao@intel.com> | 2010-06-01 17:13:58 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:26:49 -0700 |
| commit | cf50b2cde07046a88a19d5ef100421be7efc4e5a (patch) | |
| tree | 9598cb33abca9fb72d4220534851f5dbb4805153 | |
| parent | bcc8f887cba250b5b6f3d9d783f1d137cd4374b4 (diff) | |
| download | lwn-cf50b2cde07046a88a19d5ef100421be7efc4e5a.tar.gz lwn-cf50b2cde07046a88a19d5ef100421be7efc4e5a.zip | |
iwlagn: verify flow id in compressed BA packet
commit b561e8274f75831ee87e4ea378cbb1f9f050a51a upstream.
The flow id (scd_flow) in a compressed BA packet should match the txq_id
of the queue from which the aggregated packets were sent. However, in
some hardware like the 1000 series, sometimes the flow id is 0 for the
txq_id (10 to 19). This can cause the annoying message:
[ 2213.306191] iwlagn 0000:01:00.0: Received BA when not expected
[ 2213.310178] iwlagn 0000:01:00.0: Read index for DMA queue txq id (0),
index 5, is out of range [0-256] 7 7.
And even worse, if agg->wait_for_ba is true when the bad BA is arriving,
this can cause system hang due to NULL pointer dereference because the
code is operating in a wrong tx queue!
Signed-off-by: Shanyu Zhao <shanyu.zhao@intel.com>
Signed-off-by: Pradeep Kulkarni <pradeepx.kulkarni@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-tx.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c index e0ce039d9300..2f531210b581 100644 --- a/drivers/net/wireless/iwlwifi/iwl-tx.c +++ b/drivers/net/wireless/iwlwifi/iwl-tx.c @@ -1553,6 +1553,11 @@ void iwl_rx_reply_compressed_ba(struct iwl_priv *priv, sta_id = ba_resp->sta_id; tid = ba_resp->tid; agg = &priv->stations[sta_id].tid[tid].agg; + if (unlikely(agg->txq_id != scd_flow)) { + IWL_ERR(priv, "BA scd_flow %d does not match txq_id %d\n", + scd_flow, agg->txq_id); + return; + } /* Find index just before block-ack window */ index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd); |