linux-kernel - [PATCH] firmware: meson-sm: change sprintf to scnprintf

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Date:   Thu,  9 Nov 2023 11:50:29 +0300
From:   Viacheslav Bocharov <adeep@...ina.in>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH] firmware: meson-sm: change sprintf to scnprintf

Update sprintf in serial_show frunction to scnprintf command to
prevent sysfs buffer overflow (buffer always is PAGE_SIZE bytes).

Signed-off-by: Viacheslav Bocharov <adeep@...ina.in>
---
 drivers/firmware/meson/meson_sm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c
index ed60f1103053..c1c694b485ee 100644
--- a/drivers/firmware/meson/meson_sm.c
+++ b/drivers/firmware/meson/meson_sm.c
@@ -265,7 +265,7 @@ static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 		return ret;
 	}
 
-	ret = sprintf(buf, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]);
+	ret = scnprintf(buf, PAGE_SIZE, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]);
 
 	kfree(id_buf);
 
-- 
2.34.1