linux-kernel - [PATCH v3 14/22] PM / devfreq: tegra30: Ensure that target freq won't overflow

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190627211115.21138-15-digetx@gmail.com>
Date:   Fri, 28 Jun 2019 00:11:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 14/22] PM / devfreq: tegra30: Ensure that target freq won't overflow

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

Signed-off-by: Dmitry Osipenko <digetx@...il.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 d3e117d827d2..f86593ab3008 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -459,6 +459,7 @@ 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