linux-kernel - [PATCH v2] drm/bridge: ti-sn65dsi86: Avoid possible buffer overflow

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Message-Id: <20230607012355.442707-1-suhui@nfschina.com>
Date:   Wed,  7 Jun 2023 09:23:55 +0800
From:   Su Hui <suhui@...china.com>
To:     Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     andersson@...nel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Su Hui <suhui@...china.com>
Subject: [PATCH v2] drm/bridge: ti-sn65dsi86: Avoid possible buffer overflow

Smatch error:buffer overflow 'ti_sn_bridge_refclk_lut' 5 <= 5.

Fixes: cea86c5bb442 ("drm/bridge: ti-sn65dsi86: Implement the pwm_chip")
Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 7a748785c545..bb88406495e9 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -305,7 +305,7 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
 	 * The PWM refclk is based on the value written to SN_DPPLL_SRC_REG,
 	 * regardless of its actual sourcing.
 	 */
-	pdata->pwm_refclk_freq = ti_sn_bridge_refclk_lut[i];
+	pdata->pwm_refclk_freq = ti_sn_bridge_refclk_lut[i < refclk_lut_size ? i : 1];
 }
 
 static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata)
-- 
2.30.2