From 533acc0e8df7d6553f11cf91c177211cb6037968 Mon Sep 17 00:00:00 2001
From: Xiubo Li
Date: Mon, 18 Aug 2014 17:08:44 +0800
Subject: 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
Signed-off-by: Thierry Reding
---
drivers/pwm/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'drivers/pwm')
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);
--
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