linux-kernel - [PATCH -next 1/2] power: supply: adp5061: fix out-of-bounds read in adp5061_get_chg

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Message-ID: <20220827073224.713803-2-weiyongjun1@huawei.com>
Date:   Sat, 27 Aug 2022 07:32:23 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Michael Hennerich <Michael.Hennerich@...log.com>,
        Sebastian Reichel <sre@...nel.org>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH -next 1/2] power: supply: adp5061: fix out-of-bounds read in adp5061_get_chg_type()

ADP5061_CHG_STATUS_1_CHG_STATUS is masked with 0x07, which means a length
of 8, but adp5061_chg_type array size is 4, may end up reading 4 elements
beyond the end of the adp5061_chg_type[] array.

Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 drivers/power/supply/adp5061.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/adp5061.c b/drivers/power/supply/adp5061.c
index 003557043ab3..daee1161c305 100644
--- a/drivers/power/supply/adp5061.c
+++ b/drivers/power/supply/adp5061.c
@@ -427,11 +427,11 @@ static int adp5061_get_chg_type(struct adp5061_state *st,
 	if (ret < 0)
 		return ret;
 
-	chg_type = adp5061_chg_type[ADP5061_CHG_STATUS_1_CHG_STATUS(status1)];
-	if (chg_type > ADP5061_CHG_FAST_CV)
+	chg_type = ADP5061_CHG_STATUS_1_CHG_STATUS(status1);
+	if (chg_type >= ARRAY_SIZE(adp5061_chg_type))
 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 	else
-		val->intval = chg_type;
+		val->intval = adp5061_chg_type[chg_type];
 
 	return ret;
 }
-- 
2.34.1