linux-kernel - Re: [PATCH] drivers:misc: ti-st: fix potential NULL pointer dereference in st

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Message-ID: <20121008004640.GC12342@kroah.com>
Date:	Sun, 7 Oct 2012 17:46:40 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Wei Yongjun <weiyj.lk@...il.com>
Cc:	yongjun_wei@...ndmicro.com.cn, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers:misc: ti-st: fix potential NULL pointer
 dereference in st_register()

On Mon, Oct 08, 2012 at 08:41:36AM +0800, Wei Yongjun wrote:
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
> 
> The dereference should be moved below the NULL test.
> 
> dpatch engine is used to auto generate this patch.
> (https://github.com/weiyj/dpatch)
> 
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
> ---
>  drivers/misc/ti-st/st_core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
> index 46937b1..ee341ea 100644
> --- a/drivers/misc/ti-st/st_core.c
> +++ b/drivers/misc/ti-st/st_core.c
> @@ -511,13 +511,14 @@ long st_register(struct st_proto_s *new_proto)
>  	unsigned long flags = 0;
>  
>  	st_kim_ref(&st_gdata, 0);
> -	pr_info("%s(%d) ", __func__, new_proto->chnl_id);
>  	if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
>  	    || new_proto->reg_complete_cb == NULL) {
>  		pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
>  		return -EINVAL;
>  	}
>  
> +	pr_info("%s(%d) ", __func__, new_proto->chnl_id);

Why print this at all?  Can't you just drop it now?

greg k-h
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