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From:   Azeem Shaikh <azeemshaikh38@gmail.com>
To:     Amitkumar Karwar <amitkarwar@gmail.com>,
        Ganapathi Bhat <ganapathi017@gmail.com>,
        Sharvari Harisangam <sharvari.harisangam@nxp.com>,
        Xinming Hu <huxinming820@gmail.com>
Cc:     linux-hardening@vger.kernel.org,
        Azeem Shaikh <azeemshaikh38@gmail.com>,
        linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
        Kalle Valo <kvalo@kernel.org>
Subject: [PATCH] wifi: mwifiex: Replace strlcpy with strscpy
Date:   Mon, 10 Jul 2023 03:06:25 +0000
Message-ID: <20230710030625.812707-1-azeemshaikh38@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().

Direct replacement is safe here since return value of -errno
is used to check for truncation instead of sizeof(dest).

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
---
 drivers/net/wireless/marvell/mwifiex/main.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c
index 1cd9d20cca16..8d3c4bcf9c89 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -725,9 +725,8 @@ static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter,
 	 * manufacturing mode is enabled
 	 */
 	if (mfg_mode) {
-		if (strlcpy(adapter->fw_name, MFG_FIRMWARE,
-			    sizeof(adapter->fw_name)) >=
-			    sizeof(adapter->fw_name)) {
+		if (strscpy(adapter->fw_name, MFG_FIRMWARE,
+			    sizeof(adapter->fw_name)) < 0) {
 			pr_err("%s: fw_name too long!\n", __func__);
 			return -1;
 		}
-- 
2.41.0.255.g8b1d071c50-goog