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From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: marex@denx.de, stefan@agner.ch, airlied@linux.ie,
	daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com
Cc: dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH] drm: mxsfb: Check NULL pointer
Date: Wed,  3 Nov 2021 07:48:18 +0000	[thread overview]
Message-ID: <1635925699-3414834-1-git-send-email-jiasheng@iscas.ac.cn> (raw)

As we see in the drm_connector_list_iter_next(), it could return
NULL. In order to avoid the use of the NULL pointer, it may be
better to check the return value.

Fixes: c42001e ("drm: mxsfb: Use drm_panel_bridge")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6da9355..b875c11 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -145,6 +145,8 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
 	 */
 	drm_connector_list_iter_begin(drm, &iter);
 	mxsfb->connector = drm_connector_list_iter_next(&iter);
+	if (!mxsfb->connector)
+		return 1;
 	drm_connector_list_iter_end(&iter);
 
 	return 0;
-- 
2.7.4


WARNING: multiple messages have this Message-ID (diff)
From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: marex@denx.de, stefan@agner.ch, airlied@linux.ie,
	daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com
Cc: dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH] drm: mxsfb: Check NULL pointer
Date: Wed,  3 Nov 2021 07:48:18 +0000	[thread overview]
Message-ID: <1635925699-3414834-1-git-send-email-jiasheng@iscas.ac.cn> (raw)

As we see in the drm_connector_list_iter_next(), it could return
NULL. In order to avoid the use of the NULL pointer, it may be
better to check the return value.

Fixes: c42001e ("drm: mxsfb: Use drm_panel_bridge")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6da9355..b875c11 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -145,6 +145,8 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
 	 */
 	drm_connector_list_iter_begin(drm, &iter);
 	mxsfb->connector = drm_connector_list_iter_next(&iter);
+	if (!mxsfb->connector)
+		return 1;
 	drm_connector_list_iter_end(&iter);
 
 	return 0;
-- 
2.7.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: marex@denx.de, stefan@agner.ch, airlied@linux.ie,
	daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com
Cc: Jiasheng Jiang <jiasheng@iscas.ac.cn>,
	linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm: mxsfb: Check NULL pointer
Date: Wed,  3 Nov 2021 07:48:18 +0000	[thread overview]
Message-ID: <1635925699-3414834-1-git-send-email-jiasheng@iscas.ac.cn> (raw)

As we see in the drm_connector_list_iter_next(), it could return
NULL. In order to avoid the use of the NULL pointer, it may be
better to check the return value.

Fixes: c42001e ("drm: mxsfb: Use drm_panel_bridge")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6da9355..b875c11 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -145,6 +145,8 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
 	 */
 	drm_connector_list_iter_begin(drm, &iter);
 	mxsfb->connector = drm_connector_list_iter_next(&iter);
+	if (!mxsfb->connector)
+		return 1;
 	drm_connector_list_iter_end(&iter);
 
 	return 0;
-- 
2.7.4


             reply	other threads:[~2021-11-03  7:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-03  7:48 Jiasheng Jiang [this message]
2021-11-03  7:48 ` [PATCH] drm: mxsfb: Check NULL pointer Jiasheng Jiang
2021-11-03  7:48 ` Jiasheng Jiang
2021-11-03  7:58 ` Marek Vasut
2021-11-03  7:58   ` Marek Vasut
2021-11-03  7:58   ` Marek Vasut

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