staging: media: tegra-video: fix chan->mipi value on error

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chan->mipi takes the return value of tegra_mipi_request() which can be a
valid pointer or an error. However chan->mipi is checked in several places,
including error-cleanup code in tegra_csi_channels_cleanup(), as 'if
(chan->mipi)', which suggests the initial intent was that chan->mipi should
be either NULL or a valid pointer, never an error. As a consequence,
cleanup code in case of tegra_mipi_request() errors would dereference an
invalid pointer.

Fix by ensuring chan->mipi always contains either NULL or a void pointer.

Also add that to the documentation.

Fixes: 523c857e34 ("media: tegra-video: Add CSI MIPI pads calibration")
Cc: stable@vger.kernel.org
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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Luca Ceresoli 2022-11-02 12:01:01 +01:00 • committed by Hans Verkuil

parent 3a04d98608

commit 10b5ce6743

2 changed files with 2 additions and 1 deletions

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1

drivers/staging/media/tegra-video/csi.c

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2

drivers/staging/media/tegra-video/csi.h

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