linux-kernel - [PATCH] drm/i2c: tda998x: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230522155350.2337029-1-azeemshaikh38@gmail.com>
Date:   Mon, 22 May 2023 15:53:50 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/i2c: tda998x: Replace all non-returning 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().
No return values were used, so direct replacement is safe.

[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/gpu/drm/i2c/tda998x_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index db5c9343a3d2..0918d80672bb 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -1951,7 +1951,7 @@ static int tda998x_create(struct device *dev)
 	 * offset.
 	 */
 	memset(&cec_info, 0, sizeof(cec_info));
-	strlcpy(cec_info.type, "tda9950", sizeof(cec_info.type));
+	strscpy(cec_info.type, "tda9950", sizeof(cec_info.type));
 	cec_info.addr = priv->cec_addr;
 	cec_info.platform_data = &priv->cec_glue;
 	cec_info.irq = client->irq;