iwlagn: fix dangling scan request
If iwl_scan_initiate() fails for any reason,
priv->scan_request and priv->scan_vif are left
dangling. This can lead to a crash later when
iwl_bg_scan_completed() tries to run a pending
scan request.
In practice, this seems to be very rare due to
the STATUS_SCANNING check earlier. That check,
however, is wrong -- it should allow a scan to
be queued when a reset/roc scan is going on.
When a normal scan is already going on, a new
one can't be issued by mac80211, so that code
can be removed completely. I introduced this
bug when adding off-channel support in commit
266af4c745
.
Cc: stable@kernel.org [3.0]
Reported-by: Peng Yan <peng.yan@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
parent
1b9ca0272f
commit
6c80c39d9a
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@ -405,31 +405,33 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
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mutex_lock(&priv->mutex);
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if (test_bit(STATUS_SCANNING, &priv->status) &&
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priv->scan_type != IWL_SCAN_NORMAL) {
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IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
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ret = -EAGAIN;
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goto out_unlock;
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}
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/* mac80211 will only ask for one band at a time */
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priv->scan_request = req;
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priv->scan_vif = vif;
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/*
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* If an internal scan is in progress, just set
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* up the scan_request as per above.
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*/
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if (priv->scan_type != IWL_SCAN_NORMAL) {
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IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
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IWL_DEBUG_SCAN(priv,
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"SCAN request during internal scan - defer\n");
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priv->scan_request = req;
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priv->scan_vif = vif;
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ret = 0;
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} else
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} else {
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priv->scan_request = req;
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priv->scan_vif = vif;
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/*
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* mac80211 will only ask for one band at a time
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* so using channels[0] here is ok
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*/
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ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
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req->channels[0]->band);
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if (ret) {
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priv->scan_request = NULL;
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priv->scan_vif = NULL;
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}
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}
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IWL_DEBUG_MAC80211(priv, "leave\n");
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out_unlock:
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mutex_unlock(&priv->mutex);
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return ret;
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