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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>
hifive-unleashed-5.1
Xiubo Li 2014-08-18 17:08:44 +08:00 committed by Thierry Reding
parent ad16202de8
commit 533acc0e8d
1 changed files with 1 additions and 1 deletions
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2
drivers/pwm/core.c
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@ -236,7 +236,7 @@ int pwmchip_add(struct pwm_chip *chip)
int ret;
if (!chip || !chip->dev || !chip->ops || !chip->ops->config ||
!chip->ops->enable || !chip->ops->disable)
!chip->ops->enable || !chip->ops->disable || !chip->npwm)
return -EINVAL;
mutex_lock(&pwm_lock);