linux-hardening - [PATCH] drm/bridge: dw-hdmi: Replace all non-returning strlcpy with strscpy

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Date:   Mon, 22 May 2023 15:52:10 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-kernel@...r.kernel.org, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Maxime Ripard <maxime@...no.tech>,
        Lucas Stach <l.stach@...gutronix.de>,
        Guillaume BRUN <the.cheaterman@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/bridge: dw-hdmi: 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/bridge/synopsys/dw-hdmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 603bb3c51027..9d6dcaf317a1 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -533,7 +533,7 @@ static struct i2c_adapter *dw_hdmi_i2c_adapter(struct dw_hdmi *hdmi)
 	adap->owner = THIS_MODULE;
 	adap->dev.parent = hdmi->dev;
 	adap->algo = &dw_hdmi_algorithm;
-	strlcpy(adap->name, "DesignWare HDMI", sizeof(adap->name));
+	strscpy(adap->name, "DesignWare HDMI", sizeof(adap->name));
 	i2c_set_adapdata(adap, hdmi);
 
 	ret = i2c_add_adapter(adap);