linux-kernel - Re: [PATCH] nfsd4: Use kmemdup rather than duplicating its implementation

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Date:	Tue, 22 Nov 2011 15:26:54 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfsd4: Use kmemdup rather than duplicating its
 implementation

On Thu, Nov 17, 2011 at 11:43:40PM +0100, Thomas Meyer wrote:
> The semantic patch that makes this change is available
> in scripts/coccinelle/api/memdup.cocci.

Thanks, applying for 3.3.--b.

> 
> Signed-off-by: Thomas Meyer <thomas@...3r.de>
> ---
> 
> diff -u -p a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> --- a/fs/nfsd/nfs4state.c 2011-11-07 19:38:23.353822940 +0100
> +++ b/fs/nfsd/nfs4state.c 2011-11-08 10:34:05.545953251 +0100
> @@ -985,12 +985,11 @@ static struct nfs4_client *alloc_client(
>  	clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
>  	if (clp == NULL)
>  		return NULL;
> -	clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
> +	clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
>  	if (clp->cl_name.data == NULL) {
>  		kfree(clp);
>  		return NULL;
>  	}
> -	memcpy(clp->cl_name.data, name.data, name.len);
>  	clp->cl_name.len = name.len;
>  	return clp;
>  }
> diff -u -p a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> --- a/fs/nfsd/nfs4xdr.c 2011-11-07 19:38:23.357156324 +0100
> +++ b/fs/nfsd/nfs4xdr.c 2011-11-08 10:34:08.289323359 +0100
> @@ -215,10 +215,9 @@ defer_free(struct nfsd4_compoundargs *ar
>  static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
>  {
>  	if (p == argp->tmp) {
> -		p = kmalloc(nbytes, GFP_KERNEL);
> +		p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
>  		if (!p)
>  			return NULL;
> -		memcpy(p, argp->tmp, nbytes);
>  	} else {
>  		BUG_ON(p != argp->tmpp);
>  		argp->tmpp = NULL;
> --
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