[PATCH 6.6 170/638] wifi: iwlwifi: acpi: fix WPFC reading

Sasha Levin
2024-03-24T23:04:06Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 296f3e926716ded8dc29e349d2b042b362f96515 ]

The code reading the WPFC table needs to take into account
the domain type (first element in the package), shouldn't
leak the memory if it fails, and has a bad comment. Fix all
these issues.

Fixes: c4c954547755 ("wifi: iwlwifi: implement WPFC ACPI table loading")
Reported-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Gregory Greenman Gregory <gregory.greenman@intel.com>
Link: https://msgid.link/20240128084842.2afeb476b62d.I200568dc42a277e21c12be99d5aaa39b009d45da@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/intel/iwlwifi/fw/acpi.c | 10 +++++-----
drivers/net/wireless/intel/iwlwifi/fw/acpi.h | 2 +-
2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
index 359397a617153..564eeb002e8ed 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -1268,7 +1268,6 @@ void iwl_acpi_get_phy_filters(struct iwl_fw_runtime *fwrt,
if (IS_ERR(data))
return;

- /* try to read wtas table revision 1 or revision 0*/
wifi_pkg = iwl_acpi_get_wifi_pkg(fwrt->dev, data,
ACPI_WPFC_WIFI_DATA_SIZE,
&tbl_rev);
@@ -1278,13 +1277,14 @@ void iwl_acpi_get_phy_filters(struct iwl_fw_runtime *fwrt,
if (tbl_rev != 0)
goto out_free;

- BUILD_BUG_ON(ARRAY_SIZE(filters->filter_cfg_chains) != ACPI_WPFC_WIFI_DATA_SIZE);
+ BUILD_BUG_ON(ARRAY_SIZE(filters->filter_cfg_chains) !=
+ ACPI_WPFC_WIFI_DATA_SIZE - 1);

for (i = 0; i < ARRAY_SIZE(filters->filter_cfg_chains); i++) {
- if (wifi_pkg->package.elements[i].type != ACPI_TYPE_INTEGER)
- return;
+ if (wifi_pkg->package.elements[i + 1].type != ACPI_TYPE_INTEGER)
+ goto out_free;
tmp.filter_cfg_chains[i] =
- cpu_to_le32(wifi_pkg->package.elements[i].integer.value);
+ cpu_to_le32(wifi_pkg->package.elements[i + 1].integer.value);
}

IWL_DEBUG_RADIO(fwrt, "Loaded WPFC filter config from ACPI\n");
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
index c36c62d6414de..8784e50407be8 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
@@ -56,7 +56,7 @@
#define ACPI_EWRD_WIFI_DATA_SIZE_REV2 ((ACPI_SAR_PROFILE_NUM - 1) * \
ACPI_SAR_NUM_CHAINS_REV2 * \
ACPI_SAR_NUM_SUB_BANDS_REV2 + 3)
-#define ACPI_WPFC_WIFI_DATA_SIZE 4 /* 4 filter config words */
+#define ACPI_WPFC_WIFI_DATA_SIZE 5 /* domain and 4 filter config words */

/* revision 0 and 1 are identical, except for the semantics in the FW */
#define ACPI_GEO_NUM_BANDS_REV0 2
--
2.43.0