linux-kernel - [PATCH 4.8 012/140] mmc: sdhci: cast unsigned int to unsigned long long to avoid unexpeted error

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Message-Id: <20161026122220.921686342@linuxfoundation.org>
Date:   Wed, 26 Oct 2016 14:21:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Haibo Chen <haibo.chen@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.8 012/140] mmc: sdhci: cast unsigned int to unsigned long long to avoid unexpeted error

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

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

From: Haibo Chen <haibo.chen@....com>

commit 02265cd60335a2c1417abae4192611e1fc05a6e5 upstream.

Potentially overflowing expression 1000000 * data->timeout_clks with
type unsigned int is evaluated using 32-bit arithmetic, and then used
in a context that expects an expression of type unsigned long long.

To avoid overflow, cast 1000000U to type unsigned long long.
Special thanks to Coverity.

Fixes: 7f05538af71c ("mmc: sdhci: fix data timeout (part 2)")
Signed-off-by: Haibo Chen <haibo.chen@....com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -687,7 +687,7 @@ static u8 sdhci_calc_timeout(struct sdhc
 			 * host->clock is in Hz.  target_timeout is in us.
 			 * Hence, us = 1000000 * cycles / Hz.  Round up.
 			 */
-			val = 1000000 * data->timeout_clks;
+			val = 1000000ULL * data->timeout_clks;
 			if (do_div(val, host->clock))
 				target_timeout++;
 			target_timeout += val;