iwlwifi: mvm: fix theoretical NULL ptr dereference

mvmsta could have been NULL / ERR.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c
index f64e972191eb..9b59e1d7ae71 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c
@@ -312,6 +312,11 @@ static ssize_t iwl_dbgfs_reduced_txp_write(struct ieee80211_vif *vif,
         mutex_lock(&mvm->mutex);
 
         mvmsta = iwl_mvm_sta_from_staid_protected(mvm, mvmvif->ap_sta_id);
+        if (IS_ERR_OR_NULL(mvmsta)) {
+                mutex_unlock(&mvm->mutex);
+                return -ENOTCONN;
+        }
+
         mvmsta->bt_reduced_txpower_dbg = false;
         ret = iwl_mvm_bt_coex_reduced_txp(mvm, mvmvif->ap_sta_id,
                                           reduced_tx_power);