pwm: stm32: Validate breakinput data from DT (8dfa620e) · Commits · 戴 / test

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>

drivers/pwm/pwm-stm32.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

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