linux-kernel - Re: [105/105] nfsd4: fix oops on lock failure

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Date:	Sun, 17 Apr 2011 09:10:12 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	"J. Bruce Fields" <bfields@...hat.com>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Neil Brown <neilb@...e.de>, linux-nfs@...r.kernel.org
Subject: Re: [105/105] nfsd4: fix oops on lock failure

On Sun, Apr 17, 2011 at 8:03 AM, OGAWA Hirofumi
<hirofumi@...l.parknet.co.jp> wrote:
>
> I'm looking filp leak on recent kernel. Well, anyway,
> 23fcf2ec93fb8573a653408316af599939ff9a8e is strange, and I think it can
> be one of causes.

Hmm. Your patch looks correct to me. Added Neil and linux-nfs.

Bruce? Neil?

               Linus

---
> [PATCH] nfsd4: Fix filp leak
>
> 23fcf2ec93fb8573a653408316af599939ff9a8e (nfsd4: fix oops on lock failure)
>
> The above patch breaks free path for stp->st_file. If stp was inserted
> into sop->so_stateids, we have to free stp->st_file refcount. Because
> stp->st_file refcount itself is taken unrelated to stp->st_file->fi_fds[].
>
> Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> ---
>
>  fs/nfsd/nfs4state.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff -puN fs/nfsd/nfs4state.c~nfsd4-filp-leak-fix fs/nfsd/nfs4state.c
> --- linux-2.6/fs/nfsd/nfs4state.c~nfsd4-filp-leak-fix   2011-04-17 20:45:45.000000000 +0900
> +++ linux-2.6-hirofumi/fs/nfsd/nfs4state.c      2011-04-17 20:59:53.000000000 +0900
> @@ -402,8 +402,8 @@ static void free_generic_stateid(struct
>        if (stp->st_access_bmap) {
>                oflag = nfs4_access_bmap_to_omode(stp);
>                nfs4_file_put_access(stp->st_file, oflag);
> -               put_nfs4_file(stp->st_file);
>        }
> +       put_nfs4_file(stp->st_file);
>        kmem_cache_free(stateid_slab, stp);
>  }
>
> _
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
--
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