linux-kernel - [PATCH] media: rcar-csi2: Add checking to rcsi2_start

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Date:   Wed, 11 Aug 2021 16:31:42 +0300
From:   Nadezda Lutovinova <lutovinova@...ras.ru>
To:     Niklas Söderlund <niklas.soderlund@...natech.se>
Cc:     Nadezda Lutovinova <lutovinova@...ras.ru>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] media: rcar-csi2: Add checking to rcsi2_start_receiver().

If rcsi2_code_to_fmt() return NULL,
then null pointer dereference occurs in the next cycle.
The patch adds checking if format is NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@...ras.ru>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index e28eff039688..55bb584d2a13 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -553,6 +553,12 @@ static int rcsi2_start_receiver(struct rcar_csi2 *priv)
 
 	/* Code is validated in set_fmt. */
 	format = rcsi2_code_to_fmt(priv->mf.code);
+	if (!format) {
+		dev_err(priv->dev,
+			"Incorrect mbus frame format code %u\n",
+			priv->mf.code);
+		return -EINVAL;
+	}
 
 	/*
 	 * Enable all supported CSI-2 channels with virtual channel and
-- 
2.17.1