linux-kernel - [PATCH 3/8] i2c: max2175: fix potential integer overflow in max2175_set_nco

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Date:   Mon, 29 Jan 2018 18:31:47 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        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 3/8] i2c: max2175: fix potential integer overflow in
 max2175_set_nco_freq

Cast expression (clock_rate - abs_nco_freq) to s64 in order to avoid
a potential integer overflow. This variable is being used in a
context that expects an expression of type s64.

Addresses-Coverity-ID: 1446589 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/media/i2c/max2175.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/max2175.c b/drivers/media/i2c/max2175.c
index 2f1966b..3401ae6 100644
--- a/drivers/media/i2c/max2175.c
+++ b/drivers/media/i2c/max2175.c
@@ -643,7 +643,7 @@ static int max2175_set_nco_freq(struct max2175 *ctx, s32 nco_freq)
 	if (abs_nco_freq < clock_rate / 2) {
 		nco_val_desired = 2 * nco_freq;
 	} else {
-		nco_val_desired = 2 * (clock_rate - abs_nco_freq);
+		nco_val_desired = 2 * (s64)(clock_rate - abs_nco_freq);
 		if (nco_freq < 0)
 			nco_val_desired = -nco_val_desired;
 	}
-- 
2.7.4