linux-kernel - Re: nfs mount fail

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Date:	Mon, 19 Oct 2009 16:52:54 +0900
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...helsinki.fi>,
	Arjan van de Ven <arjan@...radead.org>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: nfs mount fail

On Mon, 2009-10-19 at 00:31 -0700, Yinghai Lu wrote:
> On Mon, Oct 19, 2009 at 12:08 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Pekka Enberg <penberg@...helsinki.fi> wrote:
> >
> >> Hi Ingo,
> >>
> >> On Mon, 2009-10-19 at 08:54 +0200, Ingo Molnar wrote:
> >> > * Trond Myklebust <trond.myklebust@....uio.no> wrote:
> >> >
> >> > > > yes. something miss merged again...
> >> > > >
> >> > > > need change some lines.
> >> > >
> >> > > This doesn't match mainline either. To do so, the above kfree() has to
> >> > > be at the end of the "Opt_xprt_rdma:" case...
> >> >
> >> > it's from a test patch in tip:out-of-tree:
> >> >
> >> >   d40bc6b: <not-for-merge> nfs: fix nfs_parse_mount_options() double kfree()
> >> >
> >> > (attached below)
> >> >
> >> > that fix is wrong apparently - is there a correct fix upstream perhaps?
> >>
> >> AFAICT, yes. See commit d508afb437daee7cf07da085b635c44a4ebf9b38 ("NFS:
> >> Fix a double free in nfs_parse_mount_options()") from Trond.
> >
> > sigh. That was written 3 days after your and Yinghai's patch was sent -
> > there's no Reported-by credit, there was no Cc: back to the original
> > thread - plus there was a memory leak was left in there as well. Trond?

Not sure what happened there, but I do know that evolution-2.26 manages
to lose my exchange based email every now and again. It is possible that
was why I lost track of the original patch...

> sth like this to fix possible mem leaking...
> 
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index a2c18ac..90be551 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -1253,6 +1253,7 @@ static int nfs_parse_mount_options(char *raw,
>  			default:
>  				dfprintk(MOUNT, "NFS:   unrecognized "
>  						"transport protocol\n");
> +				kfree(string);
>  				return 0;
>  			}
>  			break;

There is a possible clean up there too. We can move the other kfree()
calls out of the inner switch statement, and coalesce them all into a
single call.

Trond

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