linux-kernel - [PATCH 8/8] platform: vivid-cec: fix potential integer overflow in vivid_cec_pin_adap

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Date:   Mon, 29 Jan 2018 18:33:18 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH 8/8] platform: vivid-cec: fix potential integer overflow in
 vivid_cec_pin_adap_events

Cast len to const u64 in order to avoid a potential integer
overflow. This variable is being used in a context that expects
an expression of type const u64.

Addresses-Coverity-ID: 1454996 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/media/platform/vivid/vivid-cec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/vivid/vivid-cec.c b/drivers/media/platform/vivid/vivid-cec.c
index b55d278..30240ab 100644
--- a/drivers/media/platform/vivid/vivid-cec.c
+++ b/drivers/media/platform/vivid/vivid-cec.c
@@ -83,7 +83,7 @@ static void vivid_cec_pin_adap_events(struct cec_adapter *adap, ktime_t ts,
 	if (adap == NULL)
 		return;
 	ts = ktime_sub_us(ts, (CEC_TIM_START_BIT_TOTAL +
-			       len * 10 * CEC_TIM_DATA_BIT_TOTAL));
+			       (const u64)len * 10 * CEC_TIM_DATA_BIT_TOTAL));
 	cec_queue_pin_cec_event(adap, false, ts);
 	ts = ktime_add_us(ts, CEC_TIM_START_BIT_LOW);
 	cec_queue_pin_cec_event(adap, true, ts);
-- 
2.7.4