netdev - Re: [patch] bluetooth: debugfs changes use too much stack

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Date:	Sat, 06 Mar 2010 15:40:31 +0100
From:	Jan Ceuleers <jan.ceuleers@...puter.org>
To:	Dan Carpenter <error27@...il.com>
CC:	Marcel Holtmann <marcel@...tmann.org>,
	"David S. Miller" <davem@...emloft.net>,
	Dave Young <hidave.darkstar@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Roger Quadros <ext-roger.quadros@...ia.com>,
	Bing Zhao <bzhao@...vell.com>, linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] bluetooth: debugfs changes use too much stack

Dan Carpenter wrote:

Error handling?

> The original code would break with a 4K stack.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> This was compile tested only.  Sorry about that.
> 
> diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
> index 1a79a6c..835758f 100644
> --- a/net/bluetooth/hci_sysfs.c
> +++ b/net/bluetooth/hci_sysfs.c
> @@ -417,9 +417,11 @@ static ssize_t inquiry_cache_read(struct file *file, char __user *userbuf,
>  	struct hci_dev *hdev = file->private_data;
>  	struct inquiry_cache *cache = &hdev->inq_cache;
>  	struct inquiry_entry *e;
> -	char buf[4096];
> +	char *buf;
>  	int n = 0;
> +	ssize_t ret;
>  
> +	buf = kmalloc(4096, GFP_KERNEL);

Could this kmalloc not fail?


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