[PATCH v4 14/24] PM / devfreq: tegra30: Ensure that target freq won't overflow

Dmitry Osipenko
2019-07-07T22:32:53Z

Potentially very high boosting could cause an integer overflow for a
highly clocked memory after conversion to MHz.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/devfreq/tegra30-devfreq.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index 2f59c78930bd..0de1efdaabf4 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -460,6 +460,7 @@ static unsigned long actmon_update_target(struct tegra_devfreq *tegra,
unsigned long target_freq;

target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD + dev->boost_freq;
+ target_freq = min(target_freq, ULONG_MAX / KHZ);
target_freq = tegra_actmon_account_cpu_freq(tegra, dev, target_freq);

return target_freq;
--
2.22.0