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iwlwifi: mvm: check if mac80211_queue is valid in iwl_mvm_disable_txq 

[ Upstream commit 9a233bb802 ]

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: 34e10860ae ("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>
pull/10/head
Luca Coelho 2017-12-18 20:13:07 +02:00 committed by Greg Kroah-Hartman
parent 6a020bb3c6
commit f375195434
1 changed files with 9 additions and 2 deletions
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11
drivers/net/wireless/intel/iwlwifi/mvm/utils.c
View File

@ -810,12 +810,19 @@ int iwl_mvm_disable_txq(struct iwl_mvm *mvm, int queue, int mac80211_queue,
.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);