linux-kernel - [PATCH v2] atmel: using strlcpy() to avoid possible buffer overflows

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Message-ID: <20180630063341.9900-1-yuehaibing@huawei.com>
Date:   Sat, 30 Jun 2018 14:33:41 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <simon@...kelleys.org.uk>, <kvalo@...eaurora.org>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-wireless@...r.kernel.org>, <davem@...emloft.net>,
        <andy.shevchenko@...il.com>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v2] atmel: using strlcpy() to avoid possible buffer overflows

'firmware' is a module param which may been longer than firmware_id,
so using strlcpy() to guard against overflows. Also priv is allocated
with zeroed memory,no need to set firmware_id[0] to '\0'.

v1 -> v2: remove priv->firmware_id[0] = '\0';

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/net/wireless/atmel/atmel.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wireless/atmel/atmel.c b/drivers/net/wireless/atmel/atmel.c
index b01dc34..cec715b 100644
--- a/drivers/net/wireless/atmel/atmel.c
+++ b/drivers/net/wireless/atmel/atmel.c
@@ -1516,10 +1516,9 @@ struct net_device *init_atmel_card(unsigned short irq, unsigned long port,
 	priv->present_callback = card_present;
 	priv->card = card;
 	priv->firmware = NULL;
-	priv->firmware_id[0] = '\0';
 	priv->firmware_type = fw_type;
 	if (firmware) /* module parameter */
-		strcpy(priv->firmware_id, firmware);
+		strlcpy(priv->firmware_id, firmware, sizeof(priv->firmware_id));
 	priv->bus_type = card_present ? BUS_TYPE_PCCARD : BUS_TYPE_PCI;
 	priv->station_state = STATION_STATE_DOWN;
 	priv->do_rx_crc = 0;
-- 
2.7.0