From 00fd233ac491708d1f64b7176be73c84a18a54a2 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 26 Jun 2015 16:04:01 +0200 Subject: [PATCH] iwlwifi: mvm: check time-event vif to avoid bad deletion The time event is initialized relatively late in interface (mvmvif) initialization, so it's possible to fail before that happens. As a consequence, the driver will crash if it ever tries to delete this time event in case initialization was unsuccessful. Avoid this by using the time event's vif pointer to indicate validity. The vif pointer is != NULL whenever the id is != TE_MAX, except for this special error case where the vif pointer will have the correct property (as the whole memory is cleared on allocation) whereas the id is 0, causing a crash in trying to delete the time event from the list. Signed-off-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/time-event.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/time-event.c b/drivers/net/wireless/iwlwifi/mvm/time-event.c index d24b6a83e68c..e472729e5f14 100644 --- a/drivers/net/wireless/iwlwifi/mvm/time-event.c +++ b/drivers/net/wireless/iwlwifi/mvm/time-event.c @@ -86,7 +86,7 @@ void iwl_mvm_te_clear_data(struct iwl_mvm *mvm, { lockdep_assert_held(&mvm->time_event_lock); - if (te_data->id == TE_MAX) + if (!te_data->vif) return; list_del(&te_data->list);