pwm: stm32: Validate breakinput data from DT
Both index and level can only be either 0 or 1 and the filter value is
limited to values between (and including) 0 and 15. Validate that the
device tree node contains values that are within these ranges.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 9430b4c..c5f51a3 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -536,6 +536,7 @@ static int stm32_pwm_probe_breakinputs(struct stm32_pwm *priv,
struct device_node *np)
{
int nb, ret, array_size;
+ unsigned int i;
nb = of_property_count_elems_of_size(np, "st,breakinput",
sizeof(struct stm32_breakinput));
@@ -557,6 +558,13 @@ static int stm32_pwm_probe_breakinputs(struct stm32_pwm *priv,
if (ret)
return ret;
+ for (i = 0; i < priv->num_breakinputs; i++) {
+ if (priv->breakinputs[i].index > 1 ||
+ priv->breakinputs[i].level > 1 ||
+ priv->breakinputs[i].filter > 15)
+ return -EINVAL;
+ }
+
return stm32_pwm_apply_breakinputs(priv);
}