linux-hardening - [PATCH] wifi: mwifiex: Replace strlcpy with strscpy

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Date:   Mon, 10 Jul 2023 03:06:25 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi017@...il.com>,
        Sharvari Harisangam <sharvari.harisangam@....com>,
        Xinming Hu <huxinming820@...il.com>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kalle Valo <kvalo@...nel.org>
Subject: [PATCH] wifi: mwifiex: Replace strlcpy with strscpy

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@...il.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