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From:   Steve Longerbeam <slongerbeam@gmail.com>
To:     linux-media@vger.kernel.org
Cc:     Steve Longerbeam <slongerbeam@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        devel@driverdev.osuosl.org (open list:STAGING SUBSYSTEM),
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] media: imx: Validate frame intervals before setting
Date:   Sun, 20 Jan 2019 11:13:31 -0800
Message-Id: <20190120191331.9723-1-slongerbeam@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In the .s_frame_interval() subdev op, don't accept or set a
frame interval with a zero numerator or denominator. This fixes
a v4l2-compliance failure:

fail: v4l2-test-formats.cpp(1146):
cap->timeperframe.numerator == 0 || cap->timeperframe.denominator == 0
test VIDIOC_G/S_PARM: FAIL

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-ic-prp.c      | 9 +++++++--
 drivers/staging/media/imx/imx-ic-prpencvf.c | 9 +++++++--
 drivers/staging/media/imx/imx-media-csi.c   | 5 ++++-
 drivers/staging/media/imx/imx-media-vdic.c  | 5 ++++-
 4 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prp.c b/drivers/staging/media/imx/imx-ic-prp.c
index 98923fc844ce..a2bb5c702d74 100644
--- a/drivers/staging/media/imx/imx-ic-prp.c
+++ b/drivers/staging/media/imx/imx-ic-prp.c
@@ -422,9 +422,14 @@ static int prp_s_frame_interval(struct v4l2_subdev *sd,
 	if (fi->pad >= PRP_NUM_PADS)
 		return -EINVAL;
 
-	/* No limits on frame interval */
 	mutex_lock(&priv->lock);
-	priv->frame_interval = fi->interval;
+
+	/* No limits on valid frame intervals */
+	if (fi->interval.numerator == 0 || fi->interval.denominator == 0)
+		fi->interval = priv->frame_interval;
+	else
+		priv->frame_interval = fi->interval;
+
 	mutex_unlock(&priv->lock);
 
 	return 0;
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 33ada6612fee..d35591e9933b 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -1215,9 +1215,14 @@ static int prp_s_frame_interval(struct v4l2_subdev *sd,
 	if (fi->pad >= PRPENCVF_NUM_PADS)
 		return -EINVAL;
 
-	/* No limits on frame interval */
 	mutex_lock(&priv->lock);
-	priv->frame_interval = fi->interval;
+
+	/* No limits on valid frame intervals */
+	if (fi->interval.numerator == 0 || fi->interval.denominator == 0)
+		fi->interval = priv->frame_interval;
+	else
+		priv->frame_interval = fi->interval;
+
 	mutex_unlock(&priv->lock);
 
 	return 0;
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 555aa45e02e3..81f78a928048 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -905,7 +905,10 @@ static int csi_s_frame_interval(struct v4l2_subdev *sd,
 
 	switch (fi->pad) {
 	case CSI_SINK_PAD:
-		/* No limits on input frame interval */
+		/* No limits on valid input frame intervals */
+		if (fi->interval.numerator == 0 ||
+		    fi->interval.denominator == 0)
+			fi->interval = *input_fi;
 		/* Reset output intervals and frame skipping ratio to 1:1 */
 		priv->frame_interval[CSI_SRC_PAD_IDMAC] = fi->interval;
 		priv->frame_interval[CSI_SRC_PAD_DIRECT] = fi->interval;
diff --git a/drivers/staging/media/imx/imx-media-vdic.c b/drivers/staging/media/imx/imx-media-vdic.c
index 4a890714193e..62e09a53d171 100644
--- a/drivers/staging/media/imx/imx-media-vdic.c
+++ b/drivers/staging/media/imx/imx-media-vdic.c
@@ -818,7 +818,10 @@ static int vdic_s_frame_interval(struct v4l2_subdev *sd,
 	switch (fi->pad) {
 	case VDIC_SINK_PAD_DIRECT:
 	case VDIC_SINK_PAD_IDMAC:
-		/* No limits on input frame interval */
+		/* No limits on valid input frame intervals */
+		if (fi->interval.numerator == 0 ||
+		    fi->interval.denominator == 0)
+			fi->interval = priv->frame_interval[fi->pad];
 		/* Reset output interval */
 		*output_fi = fi->interval;
 		if (priv->csi_direct)
-- 
2.17.1