iwlwifi: mvm: check if returned value is NULL

While freeing inactive queue, check mvmsta to be valid before
dereferencing it.  Found by Klocwork.

Signed-off-by: Sharon Dvir <sharon.dvir@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index a2a1fa06b781..fc6d854b04b6 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -495,6 +495,8 @@ static int iwl_mvm_free_inactive_queue(struct iwl_mvm *mvm, int queue,
         spin_unlock_bh(&mvm->queue_info_lock);
 
         mvmsta = iwl_mvm_sta_from_staid_protected(mvm, sta_id);
+        if (WARN_ON(!mvmsta))
+                return -EINVAL;
 
         disable_agg_tids = iwl_mvm_remove_sta_queue_marking(mvm, queue);
         /* Disable the queue */