linux-kernel - [PATCH 1/2] drm/imx: Fix error handling for a kmemdup() call in imx_pd

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Message-ID: <3fd6aa8b-2529-7ff5-3e19-05267101b2a4@web.de>
Date:   Sat, 12 Oct 2019 11:07:43 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     dri-devel@...ts.freedesktop.org, kernel@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Fabio Estevam <festevam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Peter Senna Tschudin <peter.senna@...labora.com>
Cc:     Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        Rob Herring <robh@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2] drm/imx: Fix error handling for a kmemdup() call in
 imx_pd_bind()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 12 Oct 2019 10:30:21 +0200

The return value from a call of the function “kmemdup” was not checked
in this function implementation. Thus add the corresponding error handling.

Fixes: 19022aaae677dfa171a719e9d1ff04823ce65a65 ("staging: drm/imx: Add parallel display support")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/imx/parallel-display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index 35518e5de356..39c4798f56b6 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -210,8 +210,13 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 		return -ENOMEM;

 	edidp = of_get_property(np, "edid", &imxpd->edid_len);
-	if (edidp)
+	if (edidp) {
 		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
+		if (!imxpd->edid) {
+			devm_kfree(dev, imxpd);
+			return -ENOMEM;
+		}
+	}

 	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 	if (!ret) {
--
2.23.0