[PATCH v4 3/9] thermal/drivers/mediatek/lvts: Fail probe if temp_factor is zero

[Laura Nao]

temp_factor is used in lvts_temp_to_raw() and lvts_raw_to_temp(). If
platform data is incorrect and temp_factor is zero, it could cause a
division by zero. Fail the probe early to prevent a kernel crash.

Signed-off-by: Laura Nao <laura.nao at collabora.com>
---
 drivers/thermal/mediatek/lvts_thermal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index 1c54d0b75b1a..b49441d82ffd 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -1346,6 +1346,11 @@ static int lvts_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
+	if (!lvts_data->temp_factor)
+		return dev_err_probe(
+			dev, -EINVAL,
+			"temp_factor should never be zero; check platform data.\n");
+
 	golden_temp_offset = lvts_data->temp_offset;
 
 	ret = lvts_domain_init(dev, lvts_td, lvts_data);

-- 
2.39.5