linux-kernel - [PATCH v2] net: wireless: fix uninitialized pointers with free attribute

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Message-Id: <20251107-aheev-uninitialized-free-attr-wireless-v2-1-674fc3e5c78e@gmail.com>
Date: Fri, 07 Nov 2025 13:34:44 +0530
From: Ally Heev <allyheev@...il.com>
To: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Cc: Johannes Berg <johannes@...solutions.net>, 
 linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Dan Carpenter <dan.carpenter@...aro.org>, Ally Heev <allyheev@...il.com>
Subject: [PATCH v2] net: wireless: fix uninitialized pointers with free
 attribute

Uninitialized pointers with `__free` attribute can cause undefined
behavior as the memory assigned randomly to the pointer is freed
automatically when the pointer goes out of scope.

It is better to initialize and assign pointers with `__free` attribute
in one statement to ensure proper scope-based cleanup

Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/all/aPiG_F5EBQUjZqsl@stanley.mountain/
Signed-off-by: Ally Heev <allyheev@...il.com>
---
Changes in v2:
- fixed style issues
- ignore v1 of this patch
- Link to v1: https://lore.kernel.org/r/20251105-aheev-uninitialized-free-attr-wireless-v1-1-6c850a4a952a@gmail.com
---
 drivers/net/wireless/intel/iwlwifi/fw/uefi.c | 2 +-
 drivers/net/wireless/intel/iwlwifi/mld/d3.c  | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
index 4ae4d215e633e0d51194d818d479349e7c502201..c31a1187f53a79aeb0837f06250410eec4e7ea6d 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
@@ -818,8 +818,8 @@ int iwl_uefi_get_dsbr(struct iwl_fw_runtime *fwrt, u32 *value)
 
 int iwl_uefi_get_phy_filters(struct iwl_fw_runtime *fwrt)
 {
-	struct uefi_cnv_wpfc_data *data __free(kfree);
 	struct iwl_phy_specific_cfg *filters = &fwrt->phy_filters;
+	struct uefi_cnv_wpfc_data *data __free(kfree) = NULL;
 
 	data = iwl_uefi_get_verified_variable(fwrt->trans, IWL_UEFI_WPFC_NAME,
 					      "WPFC", sizeof(*data), NULL);
diff --git a/drivers/net/wireless/intel/iwlwifi/mld/d3.c b/drivers/net/wireless/intel/iwlwifi/mld/d3.c
index 1d4282a21f09e0f90a52dc02c8287ecc0e0fafe1..d3a03940b0a2c6a4b0107266cd2fc11ec9745e47 100644
--- a/drivers/net/wireless/intel/iwlwifi/mld/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mld/d3.c
@@ -996,8 +996,6 @@ static void iwl_mld_mlo_rekey(struct iwl_mld *mld,
 			      struct iwl_mld_wowlan_status *wowlan_status,
 			      struct ieee80211_vif *vif)
 {
-	struct iwl_mld_old_mlo_keys *old_keys __free(kfree) = NULL;
-
 	IWL_DEBUG_WOWLAN(mld, "Num of MLO Keys: %d\n", wowlan_status->num_mlo_keys);
 
 	if (!wowlan_status->num_mlo_keys)
@@ -1785,7 +1783,7 @@ iwl_mld_send_proto_offload(struct iwl_mld *mld,
 			   struct ieee80211_vif *vif,
 			   u8 ap_sta_id)
 {
-	struct iwl_proto_offload_cmd_v4 *cmd __free(kfree);
+	struct iwl_proto_offload_cmd_v4 *cmd __free(kfree) = NULL;
 	struct iwl_host_cmd hcmd = {
 		.id = PROT_OFFLOAD_CONFIG_CMD,
 		.dataflags[0] = IWL_HCMD_DFL_NOCOPY,

---
base-commit: c9cfc122f03711a5124b4aafab3211cf4d35a2ac
change-id: 20251105-aheev-uninitialized-free-attr-wireless-bde764fbe81c

Best regards,
-- 
Ally Heev <allyheev@...il.com>