linux-kernel - [PATCH 5.11 214/775] media: ti-vpe: cal: fix write to unallocated memory

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Date:   Mon,  1 Mar 2021 17:06:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 214/775] media: ti-vpe: cal: fix write to unallocated memory

From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

[ Upstream commit 5a402af5e19f215689e8bf3cc244c21d94eba3c4 ]

The asd allocated with v4l2_async_notifier_add_fwnode_subdev() must be
of size cal_v4l2_async_subdev, otherwise access to
cal_v4l2_async_subdev->phy will go to unallocated memory.

Fixes: 8fcb7576ad19 ("media: ti-vpe: cal: Allow multiple contexts per subdev notifier")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/ti-vpe/cal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
index 59a0266b1f399..2eef245c31a17 100644
--- a/drivers/media/platform/ti-vpe/cal.c
+++ b/drivers/media/platform/ti-vpe/cal.c
@@ -406,7 +406,7 @@ static irqreturn_t cal_irq(int irq_cal, void *data)
  */
 
 struct cal_v4l2_async_subdev {
-	struct v4l2_async_subdev asd;
+	struct v4l2_async_subdev asd; /* Must be first */
 	struct cal_camerarx *phy;
 };
 
@@ -472,7 +472,7 @@ static int cal_async_notifier_register(struct cal_dev *cal)
 		fwnode = of_fwnode_handle(phy->sensor_node);
 		asd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier,
 							    fwnode,
-							    sizeof(*asd));
+							    sizeof(*casd));
 		if (IS_ERR(asd)) {
 			phy_err(phy, "Failed to add subdev to notifier\n");
 			ret = PTR_ERR(asd);
-- 
2.27.0