linux-kernel - [PATCH] soc: imx: imx8m-blk-ctrl: off by one in imx8m_blk_ctrl

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Message-ID: <20211011123638.GB15188@kili>
Date:   Mon, 11 Oct 2021 15:36:38 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Peng Fan <peng.fan@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] soc: imx: imx8m-blk-ctrl: off by one in
 imx8m_blk_ctrl_xlate()

The > comparison should be >= to prevent reading one element beyond the
end of the array.  The onecell_data->domains[] array is allocated in
imx8m_blk_ctrl_probe() and it has "onecell_data->num_domains" elements.

Fixes: 5b340e7813d4 ("soc: imx: add i.MX8M blk-ctrl driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/soc/imx/imx8m-blk-ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
index e172d295c441..519b3651d1d9 100644
--- a/drivers/soc/imx/imx8m-blk-ctrl.c
+++ b/drivers/soc/imx/imx8m-blk-ctrl.c
@@ -139,7 +139,7 @@ imx8m_blk_ctrl_xlate(struct of_phandle_args *args, void *data)
 	unsigned int index = args->args[0];
 
 	if (args->args_count != 1 ||
-	    index > onecell_data->num_domains)
+	    index >= onecell_data->num_domains)
 		return ERR_PTR(-EINVAL);
 
 	return onecell_data->domains[index];
-- 
2.20.1