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[3/5] wifi: iwlwifi: mvm: avoid NULL dereference

Message ID 20240703064027.a661f8c65aac.I45cf09b01af8ee3d55828863958ead741ea43b7f@changeid (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series wifi: iwlwifi: fixes - 03-07-2024 | expand

Commit Message

Korenblit, Miriam Rachel July 3, 2024, 3:43 a.m. UTC 
iwl_mvm_get_bss_vif might return a NULL or ERR_PTR. Some of the callers
check only the NULL case, and some doesn't check at all.

Some of the callers even have a pointer to the mvmvif of the bss vif,
so we don't even need to call this function, and can simply get the vif
from mvmvif. Do it for those cases, and for the others - properly check
if IS_ERR_OR_NULL

Fixes: ec0d43d26f2c ("wifi: iwlwifi: mvm: Activate EMLSR based on traffic volume")
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 6 ++++--
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c      | 2 +-
 drivers/net/wireless/intel/iwlwifi/mvm/rx.c       | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index b1e6d4eee68d..678744a6fc6e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -1656,7 +1656,8 @@  static void iwl_mvm_prevent_esr_done_wk(struct wiphy *wiphy,
 	struct iwl_mvm_vif *mvmvif =
 		container_of(wk, struct iwl_mvm_vif, prevent_esr_done_wk.work);
 	struct iwl_mvm *mvm = mvmvif->mvm;
-	struct ieee80211_vif *vif = iwl_mvm_get_bss_vif(mvm);
+	struct ieee80211_vif *vif =
+		container_of((void *)mvmvif, struct ieee80211_vif, drv_priv);
 
 	mutex_lock(&mvm->mutex);
 	iwl_mvm_unblock_esr(mvm, vif, IWL_MVM_ESR_BLOCKED_PREVENTION);
@@ -1682,7 +1683,8 @@  static void iwl_mvm_unblock_esr_tpt(struct wiphy *wiphy, struct wiphy_work *wk)
 	struct iwl_mvm_vif *mvmvif =
 		container_of(wk, struct iwl_mvm_vif, unblock_esr_tpt_wk);
 	struct iwl_mvm *mvm = mvmvif->mvm;
-	struct ieee80211_vif *vif = iwl_mvm_get_bss_vif(mvm);
+	struct ieee80211_vif *vif =
+		container_of((void *)mvmvif, struct ieee80211_vif, drv_priv);
 
 	mutex_lock(&mvm->mutex);
 	iwl_mvm_unblock_esr(mvm, vif, IWL_MVM_ESR_BLOCKED_TPT);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 53283d052e18..48671540f37a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -153,7 +153,7 @@  static void iwl_mvm_rx_esr_mode_notif(struct iwl_mvm *mvm,
 	struct ieee80211_vif *vif = iwl_mvm_get_bss_vif(mvm);
 
 	/* FW recommendations is only for entering EMLSR */
-	if (!vif || iwl_mvm_vif_from_mac80211(vif)->esr_active)
+	if (IS_ERR_OR_NULL(vif) || iwl_mvm_vif_from_mac80211(vif)->esr_active)
 		return;
 
 	if (le32_to_cpu(notif->action) == ESR_RECOMMEND_ENTER)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rx.c b/drivers/net/wireless/intel/iwlwifi/mvm/rx.c
index 773cc2bdcb0b..6e933907f985 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rx.c
@@ -966,7 +966,7 @@  static void iwl_mvm_update_esr_mode_tpt(struct iwl_mvm *mvm)
 
 	lockdep_assert_held(&mvm->mutex);
 
-	if (!bss_vif)
+	if (IS_ERR_OR_NULL(bss_vif))
 		return;
 
 	mvmvif = iwl_mvm_vif_from_mac80211(bss_vif);