Patch "drm/bridge: ti-sn65dsi86: Avoid possible buffer overflow" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/bridge: ti-sn65dsi86: Avoid possible buffer overflow

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-ti-sn65dsi86-avoid-possible-buffer-overfl.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 5514f5a86b701f9ca45c36e19b730fe7b672f1c9
Author: Su Hui <suhui@xxxxxxxxxxxx>
Date:   Thu Jun 8 09:24:43 2023 +0800

    drm/bridge: ti-sn65dsi86: Avoid possible buffer overflow
    
    [ Upstream commit 95011f267c44a4d1f9ca1769e8a29ab2c559e004 ]
    
    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@xxxxxxxxxxxx>
    Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
    Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230608012443.839372-1-suhui@xxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index aeca9c066bf29..d16775c973c4e 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -298,6 +298,10 @@ static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
 		if (refclk_lut[i] == refclk_rate)
 			break;
 
+	/* avoid buffer overflow and "1" is the default rate in the datasheet. */
+	if (i >= refclk_lut_size)
+		i = 1;
+
 	regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK,
 			   REFCLK_FREQ(i));