linux-kernel - [PATCH v2] iwlwifi: dvm: use struct

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Message-Id: <20220128093147.1213351-1-chi.minghao@zte.com.cn>
Date:   Fri, 28 Jan 2022 09:31:47 +0000
From:   cgel.zte@...il.com
To:     kvalo@...nel.org
Cc:     cgel.zte@...il.com, chi.minghao@....com.cn, davem@...emloft.net,
        johannes.berg@...el.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        luciano.coelho@...el.com, netdev@...r.kernel.org, trix@...hat.com,
        zealci@....com.cn
Subject: [PATCH v2] iwlwifi: dvm: use struct_size over open coded arithmetic

From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kmalloc(). For example:

struct iwl_wipan_noa_data {
	...
	u8 data[];
}

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 drivers/net/wireless/intel/iwlwifi/dvm/rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rx.c b/drivers/net/wireless/intel/iwlwifi/dvm/rx.c
index db0c41bbeb0e..d0d842b25b86 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rx.c
@@ -915,7 +915,7 @@ static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
 		len += 1 + 2;
 		copylen += 1 + 2;
 
-		new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
+		new_data = kmalloc(struct_size(*new_data, data, len), GFP_ATOMIC);
 		if (new_data) {
 			new_data->length = len;
 			new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
-- 
2.25.1