linux-kernel - [PATCH v2] media: imx-pxp: fix ERR_PTR dereference in pxp

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Message-ID: <20240514095038.3464191-1-harshit.m.mogalapalli@oracle.com>
Date: Tue, 14 May 2024 02:50:38 -0700
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, imx@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com
Subject: [PATCH v2] media: imx-pxp: fix ERR_PTR dereference in pxp_probe()

devm_regmap_init_mmio() can fail, add a check and bail out in case of
error.

Fixes: 4e5bd3fdbeb3 ("media: imx-pxp: convert to regmap")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis and only compile tested.
v1->v2: fix error message, we dont need %d in dev_err_probe()
---
 drivers/media/platform/nxp/imx-pxp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-pxp.c b/drivers/media/platform/nxp/imx-pxp.c
index e62dc5c1a4ae..e4427e6487fb 100644
--- a/drivers/media/platform/nxp/imx-pxp.c
+++ b/drivers/media/platform/nxp/imx-pxp.c
@@ -1805,6 +1805,9 @@ static int pxp_probe(struct platform_device *pdev)
 		return PTR_ERR(mmio);
 	dev->regmap = devm_regmap_init_mmio(&pdev->dev, mmio,
 					    &pxp_regmap_config);
+	if (IS_ERR(dev->regmap))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dev->regmap),
+				     "Failed to init regmap\n");
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
-- 
2.39.3