From: Haibo Chen <haibo.chen@nxp.com> To: <adrian.hunter@intel.com>, <ulf.hansson@linaro.org>, <rmk+kernel@arm.linux.org.uk> Cc: <stable@vger.kernel.org>, <linux-mmc@vger.kernel.org>, <haibo.chen@nxp.com> Subject: [PATCH v2] mmc: sdhci: cast unsigned int to unsigned long long to avoid unexpeted error Date: Mon, 17 Oct 2016 16:18:37 +0800 [thread overview] Message-ID: <1476692317-26845-1-git-send-email-haibo.chen@nxp.com> (raw) 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@nxp.com> Cc: stable@vger.kernel.org # v3.15+ --- drivers/mmc/host/sdhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 223a91e..71654b9 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -687,7 +687,7 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd) * 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; -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Haibo Chen <haibo.chen@nxp.com> To: adrian.hunter@intel.com, ulf.hansson@linaro.org, rmk+kernel@arm.linux.org.uk Cc: stable@vger.kernel.org, linux-mmc@vger.kernel.org, haibo.chen@nxp.com Subject: [PATCH v2] mmc: sdhci: cast unsigned int to unsigned long long to avoid unexpeted error Date: Mon, 17 Oct 2016 16:18:37 +0800 [thread overview] Message-ID: <1476692317-26845-1-git-send-email-haibo.chen@nxp.com> (raw) 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@nxp.com> Cc: stable@vger.kernel.org # v3.15+ --- drivers/mmc/host/sdhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 223a91e..71654b9 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -687,7 +687,7 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd) * 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; -- 1.9.1
next reply other threads:[~2016-10-17 21:47 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-10-17 8:18 Haibo Chen [this message] 2016-10-17 8:18 ` [PATCH v2] mmc: sdhci: cast unsigned int to unsigned long long to avoid unexpeted error Haibo Chen 2016-10-17 8:13 ` Adrian Hunter 2016-10-17 13:49 ` Ulf Hansson
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