linux-kernel - [PATCH 6.8 127/715] wifi: iwlwifi: acpi: fix WPFC reading

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Message-ID: <20240324223455.1342824-128-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:25:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Gregory Greenman Gregory <gregory.greenman@...el.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.8 127/715] wifi: iwlwifi: acpi: fix WPFC reading

From: Johannes Berg <johannes.berg@...el.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@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Reviewed-by: Gregory Greenman Gregory <gregory.greenman@...el.com>
Link: https://msgid.link/20240128084842.2afeb476b62d.I200568dc42a277e21c12be99d5aaa39b009d45da@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 dcc4810cb3247..f6ee5afb3320e 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -1296,7 +1296,6 @@ 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);
@@ -1306,13 +1305,14 @@ 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 e9277f6f35821..39106ccb4b9b6 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