linux-kernel - Re: [PATCH 2/2] 9p: destroy client in symmetric order

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Date:   Thu, 29 Sep 2022 13:53:27 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     v9fs-developer@...ts.sourceforge.net, linux_oss@...debyte.com,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        syzbot+67d13108d855f451cafc@...kaller.appspotmail.com,
        davem@...emloft.net, edumazet@...gle.com, ericvh@...il.com,
        kuba@...nel.org, lucho@...kov.net, netdev@...r.kernel.org,
        syzbot+de52531662ebb8823b26@...kaller.appspotmail.com
Subject: Re: [PATCH 2/2] 9p: destroy client in symmetric order

On Thu, Sep 29, 2022 at 07:29:33PM +0900, Dominique Martinet wrote:
> Leon Romanovsky wrote on Thu, Sep 29, 2022 at 12:37:56PM +0300:
> > Make sure that all variables are initialized and released in correct
> > order.
> 
> Haven't tried running or compiling, comments out of my head that might
> be wrong below
> 
> > 
> > Reported-by: syzbot+de52531662ebb8823b26@...kaller.appspotmail.com
> 
> You're adding this report tag but I don't see how you fix that failure.
> What you need is p9_tag_cleanup(clnt) from p9_client_destroy -- I assume
> this isn't possible for any fid to be allocated at this point so the fid
> destroying loop is -probably- optional.
> 
> I would assume it is needed from p9_client_version failures.
> 
> 
> > Signed-off-by: Leon Romanovsky <leon@...nel.org>
> > ---
> >  net/9p/client.c | 37 ++++++++++++-------------------------
> >  1 file changed, 12 insertions(+), 25 deletions(-)
> > 
> > diff --git a/net/9p/client.c b/net/9p/client.c
> > index aaa37b07e30a..8277e33506e7 100644
> > --- a/net/9p/client.c
> > +++ b/net/9p/client.c
> > @@ -179,7 +179,6 @@ static int parse_opts(char *opts, struct p9_client *clnt)
> >  				goto free_and_return;
> >  			}
> >  
> > -			v9fs_put_trans(clnt->trans_mod);
> 
> Pretty sure you'll be "leaking transports" if someone tries to pass
> trans=foo multiple times; this can't be removed...(continues below)...

It is pity, you are right.

Thanks