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

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Date:   Sat, 12 Oct 2019 11:10:07 +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 2/2] drm/imx: Fix error handling for a kmemdup() call in
 imx_ldb_panel_ddc()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 12 Oct 2019 10:33:47 +0200

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

This issue was detected by using the Coccinelle software.

Fixes: dc80d7038883feca2abd08975165bc0d83c84762 ("drm/imx-ldb: Add support to drm-bridge")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/imx/imx-ldb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 208069faf183..801a2265dd11 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -569,6 +569,8 @@ static int imx_ldb_panel_ddc(struct device *dev,
 			channel->edid = kmemdup(edidp,
 						channel->edid_len,
 						GFP_KERNEL);
+			if (!channel->edid)
+				return -ENOMEM;
 		} else if (!channel->panel) {
 			/* fallback to display-timings node */
 			ret = of_get_drm_display_mode(child,
--
2.23.0