linux-kernel - [PATCH AUTOSEL 4.19 2/9] regulator: pfuze100: Fix the global-out-of-bounds access in pfuze100_regulator

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Message-Id: <20220914090445.471489-2-sashal@kernel.org>
Date:   Wed, 14 Sep 2022 05:04:36 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiaolei Wang <xiaolei.wang@...driver.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com
Subject: [PATCH AUTOSEL 4.19 2/9] regulator: pfuze100: Fix the global-out-of-bounds access in pfuze100_regulator_probe()

From: Xiaolei Wang <xiaolei.wang@...driver.com>

[ Upstream commit 78e1e867f44e6bdc72c0e6a2609a3407642fb30b ]

The pfuze_chip::regulator_descs is an array of size
PFUZE100_MAX_REGULATOR, the pfuze_chip::pfuze_regulators
is the pointer to the real regulators of a specific device.
The number of real regulator is supposed to be less than
the PFUZE100_MAX_REGULATOR, so we should use the size of
'regulator_num * sizeof(struct pfuze_regulator)' in memcpy().
This fixes the out of bounds access bug reported by KASAN.

Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
Link: https://lore.kernel.org/r/20220825111922.1368055-1-xiaolei.wang@windriver.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/regulator/pfuze100-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index 8b1940110561a..b1d73a6c7809e 100644
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -710,7 +710,7 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
 		((pfuze_chip->chip_id == PFUZE3000) ? "3000" : "3001"))));
 
 	memcpy(pfuze_chip->regulator_descs, pfuze_chip->pfuze_regulators,
-		sizeof(pfuze_chip->regulator_descs));
+		regulator_num * sizeof(struct pfuze_regulator));
 
 	ret = pfuze_parse_regulators_dt(pfuze_chip);
 	if (ret)
-- 
2.35.1