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| author | Xiubo Li <Li.Xiubo@freescale.com> | 2014-08-18 17:08:44 +0800 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2014-08-25 14:38:12 +0200 |
| commit | 533acc0e8df7d6553f11cf91c177211cb6037968 (patch) | |
| tree | 812cd4e995141cfe2c1ce2533f52f4017d5af6b1 | |
| parent | ad16202de8d884c10ef7637ea3982953519c2418 (diff) | |
| download | op-kernel-dev-533acc0e8df7d6553f11cf91c177211cb6037968.zip op-kernel-dev-533acc0e8df7d6553f11cf91c177211cb6037968.tar.gz | |
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>
| -rw-r--r-- | drivers/pwm/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index d2c3592..8c748b1 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -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); |
