linux-kernel - Re: [PATCH] nfs: Ignore kmemleak false positive in nfs_readdir_make

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Date:	Thu, 11 Nov 2010 09:51:10 -0500
From:	Bryan Schumaker <bjschuma@...app.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: Re: [PATCH] nfs: Ignore kmemleak false positive in nfs_readdir_make_qstr

Thanks!  The patch works for me.

Bryan

On 11/11/2010 07:53 AM, Catalin Marinas wrote:
> Strings allocated via kmemdup() in nfs_readdir_make_qstr() are
> referenced from the nfs_cache_array which is stored in a page cache
> page. Kmemleak does not scan such pages and it reports several false
> positives. This patch annotates the string->name pointer so that
> kmemleak does not consider it a real leak.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Bryan Schumaker <bjschuma@...app.com>
> Cc: Trond Myklebust <Trond.Myklebust@...app.com>
> ---
>  fs/nfs/dir.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
> index 07ac384..a9f9e14 100644
> --- a/fs/nfs/dir.c
> +++ b/fs/nfs/dir.c
> @@ -34,6 +34,7 @@
>  #include <linux/mount.h>
>  #include <linux/sched.h>
>  #include <linux/vmalloc.h>
> +#include <linux/kmemleak.h>
>  
>  #include "delegation.h"
>  #include "iostat.h"
> @@ -231,6 +232,11 @@ int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int le
>  	string->name = kmemdup(name, len, GFP_KERNEL);
>  	if (string->name == NULL)
>  		return -ENOMEM;
> +	/*
> +	 * Avoid a kmemleak false positive. The pointer to the name is stored
> +	 * in a page cache page which kmemleak does not scan.
> +	 */
> +	kmemleak_not_leak(string->name);
>  	string->hash = full_name_hash(name, len);
>  	return 0;
>  }

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