linux-kernel - [PATCH 5.1 276/371] opp: Dont use IS

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Date:   Wed, 24 Jul 2019 21:20:28 +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, Marc Dietrich <marvin24@....de>,
        Dmitry Osipenko <digetx@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 5.1 276/371] opp: Dont use IS_ERR on invalid supplies

From: Dmitry Osipenko <digetx@...il.com>

commit 560d1bcad715c215e7ffe5d7cffe045974b623d0 upstream.

_set_opp_custom() receives a set of OPP supplies as its arguments and
the caller of it passes NULL when the supplies are not valid. But
_set_opp_custom(), by mistake, checks for error by performing
IS_ERR(old_supply) on it which will always evaluate to false.

The problem was spotted during of testing of upcoming update for the
NVIDIA Tegra CPUFreq driver.

Cc: stable <stable@...r.kernel.org>
Fixes: 7e535993fa4f ("OPP: Separate out custom OPP handler specific code")
Reported-by: Marc Dietrich <marvin24@....de>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
[ Viresh: Massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/opp/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -631,7 +631,7 @@ static int _set_opp_custom(const struct
 
 	data->old_opp.rate = old_freq;
 	size = sizeof(*old_supply) * opp_table->regulator_count;
-	if (IS_ERR(old_supply))
+	if (!old_supply)
 		memset(data->old_opp.supplies, 0, size);
 	else
 		memcpy(data->old_opp.supplies, old_supply, size);