linux-kernel - [PATCH 2/2] iwlwifi: Use struct

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Message-ID: <20190128064432.17576-3-yuehaibing@huawei.com>
Date:   Mon, 28 Jan 2019 14:44:32 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <johannes.berg@...el.com>, <emmanuel.grumbach@...el.com>,
        <luciano.coelho@...el.com>, <linuxwifi@...el.com>,
        <kvalo@...eaurora.org>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-wireless@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH 2/2] iwlwifi: Use struct_size() in kzalloc

Use struct_size() in kzalloc instead of the 'regd_to_copy'

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
index 569cc50..cb9e722 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
@@ -1093,7 +1093,7 @@ iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
 	const u8 *nvm_chan = cfg->nvm_type == IWL_NVM_EXT ?
 			     iwl_ext_nvm_channels : iwl_nvm_channels;
 	struct ieee80211_regdomain *regd, *copy_rd;
-	int size_of_regd, regd_to_copy;
+	int size_of_regd;
 	struct ieee80211_reg_rule *rule;
 	struct regdb_ptrs *regdb_ptrs;
 	enum nl80211_band band;
@@ -1193,10 +1193,8 @@ iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
 	 * Narrow down regdom for unused regulatory rules to prevent hole
 	 * between reg rules to wmm rules.
 	 */
-	regd_to_copy = sizeof(struct ieee80211_regdomain) +
-		valid_rules * sizeof(struct ieee80211_reg_rule);
-
-	copy_rd = kmemdup(regd, regd_to_copy, GFP_KERNEL);
+	copy_rd = kmemdup(regd, struct_size(regd, reg_rules, valid_rules),
+			  GFP_KERNEL);
 	if (!copy_rd)
 		copy_rd = ERR_PTR(-ENOMEM);
 
-- 
2.7.4