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pwm: stm32: Validate breakinput data from DT

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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>
This commit is contained in:
Thierry Reding 2019-10-16 12:06:31 +02:00
parent 27938fd8ba
commit 8dfa620e3d
1 changed files with 8 additions and 0 deletions
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8
drivers/pwm/pwm-stm32.c
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@ -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);
}