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pwm: Fix possible ZERO_SIZE_PTR pointer dereferencing error.
Since we cannot make sure the 'chip->npwm' will always be none zero here, and then if either equal to zero, the kzalloc() will return ZERO_SIZE_PTR, which equals to ((void *)16). So this patch fix this with just doing the zero check before calling kzalloc(). Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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@ -236,7 +236,7 @@ int pwmchip_add(struct pwm_chip *chip)
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int ret;
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if (!chip || !chip->dev || !chip->ops || !chip->ops->config ||
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!chip->ops->enable || !chip->ops->disable)
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!chip->ops->enable || !chip->ops->disable || !chip->npwm)
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return -EINVAL;
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mutex_lock(&pwm_lock);
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