[PATCH v6 1/3] hwmon: emc2305: Validate fan channel index

[florin . leotescu]

From: Florin Leotescu <florin.leotescu@xxxxxxx>

The fan channel index is used to access per-channel data structures.
Validate the index agains the number of available channels
before use to prevent out-of-bounds access if an invalid
value is provided.

Signed-off-by: Florin Leotescu <florin.leotescu@xxxxxxx>
---
 drivers/hwmon/emc2305.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwmon/emc2305.c b/drivers/hwmon/emc2305.c
index 64b213e1451e..0b42b82c8e22 100644
--- a/drivers/hwmon/emc2305.c
+++ b/drivers/hwmon/emc2305.c
@@ -548,6 +548,12 @@ static int emc2305_of_parse_pwm_child(struct device *dev,
 		return ret;
 	}
 
+	if (ch >= data->pwm_num) {
+		dev_err(dev, "invalid reg %u for node %pOF (valid range 0-%u)\n", ch, child,
+			data->pwm_num - 1);
+		return -EINVAL;
+	}
+
 	ret = of_parse_phandle_with_args(child, "pwms", "#pwm-cells", 0, &args);
 
 	if (ret)
-- 
2.34.1