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iwlwifi: mvm: BT Coex fix another NULL pointer dereference

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This patch is very similar to a previous fix: 22cba0c085

When we disassociate, mac80211 removes the station and
then, it sets the bss it unsets the assoc bool in bss_info.

Since the firwmware wants it the opposite (first set the
MAC context as unassoc, and only then, remove the STA of
the API), we have a small period of time in which the STA
in firmware doesn't have a valid ieee80211_sta pointer.
During that time, iwl_mvm_vif->ap_sta_id, is still set
to the STA in firmware that represent the AP.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2013-10-21 11:03:53 +03:00
parent a338f1efa5
commit 56c07a9c95
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/iwlwifi/mvm/bt-coex.c
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@ -841,6 +841,11 @@ static void iwl_mvm_bt_rssi_iterator(void *_data, u8 *mac,
sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[mvmvif->ap_sta_id],
lockdep_is_held(&mvm->mutex));
/* This can happen if the station has been removed right now */
if (IS_ERR_OR_NULL(sta))
return;
mvmsta = (void *)sta->drv_priv;
data->num_bss_ifaces++;