linux-kernel - [PATCH 3.14 005/114] media: mt9v032: fix hblank calculation

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Date:	Mon, 15 Sep 2014 12:25:05 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>
Subject: [PATCH 3.14 005/114] media: mt9v032: fix hblank calculation

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Philipp Zabel <p.zabel@...gutronix.de>

commit f17bc3f4707eb87bdb80b895911c551cdd606fbd upstream.

Since (min_row_time - crop->width) can be negative, we have to do a signed
comparison here. Otherwise max_t casts the negative value to unsigned int
and sets min_hblank to that invalid value.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/i2c/mt9v032.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/i2c/mt9v032.c
+++ b/drivers/media/i2c/mt9v032.c
@@ -305,8 +305,8 @@ mt9v032_update_hblank(struct mt9v032 *mt
 
 	if (mt9v032->version->version == MT9V034_CHIP_ID_REV1)
 		min_hblank += (mt9v032->hratio - 1) * 10;
-	min_hblank = max_t(unsigned int, (int)mt9v032->model->data->min_row_time - crop->width,
-			   (int)min_hblank);
+	min_hblank = max_t(int, mt9v032->model->data->min_row_time - crop->width,
+			   min_hblank);
 	hblank = max_t(unsigned int, mt9v032->hblank, min_hblank);
 
 	return mt9v032_write(client, MT9V032_HORIZONTAL_BLANKING, hblank);


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