linux-kernel - [PATCH] PM / Domains: Fix integer overflows on u32 bit multiplies

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Date:   Sun,  7 Feb 2021 22:46:48 +0000
From:   Colin King <colin.king@...onical.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marc Titinger <mtitinger+renesas@...libre.com>,
        Lina Iyer <lina.iyer@...aro.org>, linux-pm@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PM / Domains: Fix integer overflows on u32 bit multiplies

From: Colin Ian King <colin.king@...onical.com>

There are three occurrances of u32 variables being multiplied by
1000 using 32 bit multiplies and the result being assigned to a
64 bit signed integer.  These can potentially lead to a 32 bit
overflows, so fix this by casting 1000 to a UL first to force
a 64 bit multiply hence avoiding the overflow.

Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 30f604283e05 ("PM / Domains: Allow domain power states to be read from DT")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/base/power/domain.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index aaf6c83b5cf6..ddeff69126ff 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2831,10 +2831,10 @@ static int genpd_parse_state(struct genpd_power_state *genpd_state,
 
 	err = of_property_read_u32(state_node, "min-residency-us", &residency);
 	if (!err)
-		genpd_state->residency_ns = 1000 * residency;
+		genpd_state->residency_ns = 1000UL * residency;
 
-	genpd_state->power_on_latency_ns = 1000 * exit_latency;
-	genpd_state->power_off_latency_ns = 1000 * entry_latency;
+	genpd_state->power_on_latency_ns = 1000UL * exit_latency;
+	genpd_state->power_off_latency_ns = 1000UL * entry_latency;
 	genpd_state->fwnode = &state_node->fwnode;
 
 	return 0;
-- 
2.29.2