linux-kernel - [PATCH v2 2/5] rtc: zynqmp: check calibration max value

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Message-Id: <20260108-zynqmp-rtc-updates-v2-2-864c161fa83d@vaisala.com>
Date: Thu, 08 Jan 2026 12:51:13 +0000
From: Tomas Melin <tomas.melin@...sala.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Michal Simek <michal.simek@....com>
Cc: linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Tomas Melin <tomas.melin@...sala.com>
Subject: [PATCH v2 2/5] rtc: zynqmp: check calibration max value

Enable check to not overflow the calibration
max value.

Signed-off-by: Tomas Melin <tomas.melin@...sala.com>
---
 drivers/rtc/rtc-zynqmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index 856bc1678e7d31144f320ae9f75fc58c742a2a64..caacce3725e2ef3803ea42d40e77ceaeb7d7b914 100644
--- a/drivers/rtc/rtc-zynqmp.c
+++ b/drivers/rtc/rtc-zynqmp.c
@@ -349,6 +349,11 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 		xrtcdev->freq--;
 	}
 
+	if (xrtcdev->freq > RTC_TICK_MASK) {
+		dev_err(&pdev->dev, "Invalid RTC calibration value\n");
+		return -EINVAL;
+	}
+
 	ret = readl(xrtcdev->reg_base + RTC_CALIB_RD);
 	if (!ret)
 		writel(xrtcdev->freq, (xrtcdev->reg_base + RTC_CALIB_WR));

-- 
2.47.3