linux-kernel - Re: [PATCH] Fix size argument to memset call in nfsacl

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Date:	Thu, 03 Feb 2011 14:28:50 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Jesper Juhl <jj@...osbits.net>, Milton Miller <miltonm@....com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Neil Brown <neilb@...e.de>, bfields@...ldses.org
Subject: Re: [PATCH] Fix size argument to memset call in nfsacl_encode

On Thu, 2011-02-03 at 20:15 +0100, Jesper Juhl wrote: 
> We want to give memset() the sizeof(struct posix_acl), not
> sizeof(struct posix_acl *).
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  nfsacl.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/nfs_common/nfsacl.c b/fs/nfs_common/nfsacl.c
> index 84c27d6..bc6d81b 100644
> --- a/fs/nfs_common/nfsacl.c
> +++ b/fs/nfs_common/nfsacl.c
> @@ -117,7 +117,7 @@ int nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
>  		 * invoked in contexts where a memory allocation failure is
>  		 * fatal.  Fortunately this fake ACL is small enough to
>  		 * construct on the stack. */
> -		memset(acl2, 0, sizeof(acl2));
> +		memset(acl2, 0, sizeof(*acl2));
>  		posix_acl_init(acl2, 4);
>  
>  		/* Insert entries in canonical order: other orders seem

Ccing Milton Miller who also sent in the same patch.

Neither patch is correct afaics. posix_acl_init() will clobber the above
memset, and so the correct fix is just to get rid of it...

Cheers
  Trond
-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com

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