[PATCH 4.16 106/272] iwlwifi: mvm: check if mac80211_queue is valid in iwl_mvm_disable_txq

Greg Kroah-Hartman
2018-05-28T11:54:30Z

From: Luca Coelho <luciano.coelho@intel.com>

[ Upstream commit 9a233bb8025105db9a60b5d761005cc5a6c77f3d ]

Sometimes iwl_mvm_disable_txq() may be called with mac80211_queue ==
IEEE80211_INVAL_HW_QUEUE, and this would cause us to use BIT(0xFF)
which is way too large for the u16 we used to store it in
hw_queue_to_mac820211. If this happens the following UBSAN warning
will be generated:

[ 167.185167] UBSAN: Undefined behaviour in drivers/net/wireless/intel/iwlwifi/mvm/utils.c:838:5
[ 167.185171] shift exponent 255 is too large for 64-bit type 'long unsigned int'

Fix that by checking that it is not IEEE80211_INVAL_HW_QUEUE and,
while at it, add a warning if the queue number is larger than
IEEE80211_MAX_QUEUES.

Fixes: 34e10860ae8d ("iwlwifi: mvm: remove references to queue_info in new TX path")
Reported-by: Paul Menzel <pmenzel+linux-wireless@molgen.mpg.de>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/intel/iwlwifi/mvm/utils.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
@@ -800,12 +800,19 @@ int iwl_mvm_disable_txq(struct iwl_mvm *
.scd_queue = queue,
.action = SCD_CFG_DISABLE_QUEUE,
};
- bool remove_mac_queue = true;
+ bool remove_mac_queue = mac80211_queue != IEEE80211_INVAL_HW_QUEUE;
int ret;

+ if (WARN_ON(remove_mac_queue && mac80211_queue >= IEEE80211_MAX_QUEUES))
+ return -EINVAL;
+
if (iwl_mvm_has_new_tx_api(mvm)) {
spin_lock_bh(&mvm->queue_info_lock);
- mvm->hw_queue_to_mac80211[queue] &= ~BIT(mac80211_queue);
+
+ if (remove_mac_queue)
+ mvm->hw_queue_to_mac80211[queue] &=
+ ~BIT(mac80211_queue);
+
spin_unlock_bh(&mvm->queue_info_lock);

iwl_trans_txq_free(mvm->trans, queue);