Patch "iwlwifi: mvm: avoid crash on restart w/o reserved queues" has been added to the 4.9-stable tree

Patch "iwlwifi: mvm: avoid crash on restart w/o reserved queues" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iwlwifi-mvm-avoid-crash-on-restart-w-o-reserved-queues.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 03c902bff524e0cf664737a33f2365f7837040bf Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Fri, 2 Dec 2016 12:03:36 +0100
Subject: iwlwifi: mvm: avoid crash on restart w/o reserved queues

From: Johannes Berg <johannes.berg@intel.com>

commit 03c902bff524e0cf664737a33f2365f7837040bf upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -1144,9 +1144,10 @@ static void iwl_mvm_realloc_queues_after
 		.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];


Patches currently in stable-queue which might be from johannes.berg@intel.com are

queue-4.9/iwlwifi-mvm-avoid-crash-on-restart-w-o-reserved-queues.patch