From 4f1bdf0a75a4d16149c470800d8c4bf3da13e92d Mon Sep 17 00:00:00 2001 From: "Maciej S. Szmigiero" Date: Tue, 10 Oct 2017 17:35:37 -0400 Subject: [PATCH] media: cx25840: fix a possible divide by zero in set_fmt callback If set_fmt callback is called with format->width or format->height set to zero and HACTIVE_CNT or VACTIVE_CNT bits (respectively) in chip are zero we will divide by zero later in this callback when we try to calculate HSC or VSC values. Fix this by explicitly rejecting these values. Signed-off-by: Maciej S. Szmigiero Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/cx25840/cx25840-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/cx25840/cx25840-core.c b/drivers/media/i2c/cx25840/cx25840-core.c index ec0e91369853..940c8b171249 100644 --- a/drivers/media/i2c/cx25840/cx25840-core.c +++ b/drivers/media/i2c/cx25840/cx25840-core.c @@ -1395,8 +1395,9 @@ static int cx25840_set_fmt(struct v4l2_subdev *sd, * height. Without that margin the cx23885 fails in this * check. */ - if ((fmt->width * 16 < Hsrc) || (Hsrc < fmt->width) || - (Vlines * 8 < Vsrc) || (Vsrc + 1 < Vlines)) { + if ((fmt->width == 0) || (Vlines == 0) || + (fmt->width * 16 < Hsrc) || (Hsrc < fmt->width) || + (Vlines * 8 < Vsrc) || (Vsrc + 1 < Vlines)) { v4l_err(client, "%dx%d is not a valid size!\n", fmt->width, fmt->height); return -ERANGE; -- 2.30.2