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media: rcar-csi2: Add checking to rcsi2_start_receiver()

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[ Upstream commit fc41665498 ]

If rcsi2_code_to_fmt() return NULL, then null pointer dereference occurs
in the next cycle. That should not be possible now but adding checking
protects from future bugs.
The patch adds checking if format is NULL.

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

Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nadezda Lutovinova 2021-08-11 19:18:16 +02:00 • committed by Greg Kroah-Hartman
commit 1f38e5e803
1 changed files with 2 additions and 0 deletions
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2
drivers/media/platform/rcar-vin/rcar-csi2.c
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@ -544,6 +544,8 @@ 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)
return -EINVAL;
/*
* Enable all supported CSI-2 channels with virtual channel and