linux-kernel - [PATCH v2 next] media: imx-jpeg: Fix potential error pointer dereference in detach

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Message-ID: <ZxF0yOCms6cldOlV@stanley.mountain>
Date: Thu, 17 Oct 2024 23:34:16 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Ming Qian <ming.qian@....com>
Cc: Mirela Rabulea <mirela.rabulea@....com>,
	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>,
	Hans Verkuil <hverkuil@...all.nl>, TaoJiang <tao.jiang_2@....com>,
	imx@...ts.linux.dev, linux-media@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH v2 next] media: imx-jpeg: Fix potential error pointer
 dereference in detach_pm()

The proble is on the first line:

	if (jpeg->pd_dev[i] && !pm_runtime_suspended(jpeg->pd_dev[i]))

If jpeg->pd_dev[i] is an error pointer, then passing it to
pm_runtime_suspended() will lead to an Oops.  The other conditions
check for both error pointers and NULL, but it would be more clear to
use the IS_ERR_OR_NULL() check for that.

Fixes: fd0af4cd35da ("media: imx-jpeg: Ensure power suppliers be suspended before detach them")
Cc: <stable@...r.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
v2: The buggy patch hasn't hit Linus's tree yet, but it's destined for stable so
    add a stable tag to this too.

 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
index d8e946aebba2..918ab12edc9e 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
@@ -2679,11 +2679,12 @@ static void mxc_jpeg_detach_pm_domains(struct mxc_jpeg_dev *jpeg)
 	int i;
 
 	for (i = 0; i < jpeg->num_domains; i++) {
-		if (jpeg->pd_dev[i] && !pm_runtime_suspended(jpeg->pd_dev[i]))
+		if (!IS_ERR_OR_NULL(jpeg->pd_dev[i]) &&
+		    !pm_runtime_suspended(jpeg->pd_dev[i]))
 			pm_runtime_force_suspend(jpeg->pd_dev[i]);
-		if (jpeg->pd_link[i] && !IS_ERR(jpeg->pd_link[i]))
+		if (!IS_ERR_OR_NULL(jpeg->pd_link[i]))
 			device_link_del(jpeg->pd_link[i]);
-		if (jpeg->pd_dev[i] && !IS_ERR(jpeg->pd_dev[i]))
+		if (!IS_ERR_OR_NULL(jpeg->pd_dev[i]))
 			dev_pm_domain_detach(jpeg->pd_dev[i], true);
 		jpeg->pd_dev[i] = NULL;
 		jpeg->pd_link[i] = NULL;
-- 
2.45.2