iwlwifi: mvm: avoid crash on restart w/o reserved queues

When the firmware restarts in a situation in which any station
has no queue reserved anymore because that queue was used, the
code will crash trying to access the queue_info array at the
offset 255, which is far too big. Fix this by checking that a
queue is actually reserved before writing its status.

Fixes: 8d98ae6eb0d5 ("iwlwifi: mvm: re-assign old queues after hw restart in dqa mode")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 636c8b03e318..09e9e2e3ed04 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -1164,9 +1164,10 @@ static void iwl_mvm_realloc_queues_after_restart(struct iwl_mvm *mvm,
                 .frame_limit = IWL_FRAME_LIMIT,
         };
 
-        /* Make sure reserved queue is still marked as such (or allocated) */
-        mvm->queue_info[mvm_sta->reserved_queue].status =
-                IWL_MVM_QUEUE_RESERVED;
+        /* Make sure reserved queue is still marked as such (if allocated) */
+        if (mvm_sta->reserved_queue != IEEE80211_INVAL_HW_QUEUE)
+                mvm->queue_info[mvm_sta->reserved_queue].status =
+                        IWL_MVM_QUEUE_RESERVED;
 
         for (i = 0; i <= IWL_MAX_TID_COUNT; i++) {
                 struct iwl_mvm_tid_data *tid_data = &mvm_sta->tid_data[i];