linux-kernel - Re: [PATCH] tipc: Use kmemdup instead of kmalloc and memcpy

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Message-ID: <5770D7D2.7070204@gmail.com>
Date:	Mon, 27 Jun 2016 15:37:54 +0800
From:	Ying Xue <ying.xue0@...il.com>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>, jon.maloy@...csson.com,
	davem@...emloft.net, netdev@...r.kernel.org,
	tipc-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: Re: [PATCH] tipc: Use kmemdup instead of kmalloc and memcpy

On 06/23/2016 12:49 PM, Amitoj Kaur Chawla wrote:
> Replace calls to kmalloc followed by a memcpy with a direct call to
> kmemdup.
> 
> The Coccinelle semantic patch used to make this change is as follows:
> @@
> expression from,to,size,flag;
> statement S;
> @@
> 
> -  to = \(kmalloc\|kzalloc\)(size,flag);
> +  to = kmemdup(from,size,flag);
>    if (to==NULL || ...) S
> -  memcpy(to, from, size);
> 
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>

Acked-by: Ying Xue <ying.xue@...driver.com>

> ---
>  net/tipc/server.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/tipc/server.c b/net/tipc/server.c
> index 2446bfb..38a6f33 100644
> --- a/net/tipc/server.c
> +++ b/net/tipc/server.c
> @@ -411,13 +411,12 @@ static struct outqueue_entry *tipc_alloc_entry(void *data, int len)
>  	if (!entry)
>  		return NULL;
>  
> -	buf = kmalloc(len, GFP_ATOMIC);
> +	buf = kmemdup(data, len, GFP_ATOMIC);
>  	if (!buf) {
>  		kfree(entry);
>  		return NULL;
>  	}
>  
> -	memcpy(buf, data, len);
>  	entry->iov.iov_base = buf;
>  	entry->iov.iov_len = len;
>  
>