linux-kernel - [PATCH] rtc: fix error return in pm80x_rtc_set

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Message-ID: <20251002091651.11-1-alsp705@gmail.com>
Date: Thu,  2 Oct 2025 12:16:49 +0300
From: Alexandr Sapozhnkiov <alsp705@...il.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
	linux-rtc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Alexandr Sapozhnikov <alsp705@...il.com>,
	lvc-project@...uxtesting.org
Subject: [PATCH] rtc: fix error return in pm80x_rtc_set_alarm()

From: Alexandr Sapozhnikov <alsp705@...il.com>

The regmap_raw_read() function may return an error.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexandr Sapozhnikov <alsp705@...il.com>
---
 drivers/rtc/rtc-88pm80x.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-88pm80x.c b/drivers/rtc/rtc-88pm80x.c
index f40cc06b0979..f26d8a1e827b 100644
--- a/drivers/rtc/rtc-88pm80x.c
+++ b/drivers/rtc/rtc-88pm80x.c
@@ -173,17 +173,21 @@ static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	struct rtc_time now_tm, alarm_tm;
 	unsigned long ticks, base, data;
 	unsigned char buf[4];
-	int mask;
+	int mask, ret;
 
 	regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
 
-	regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+	ret = regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+	if (ret)
+		return ret;
 	base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
 		(buf[1] << 8) | buf[0];
 	dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
 
 	/* load 32-bit read-only counter */
-	regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
+	ret = regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
+	if (ret)
+		return ret;
 	data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
 		(buf[1] << 8) | buf[0];
 	ticks = base + data;
-- 
2.43.0