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Message-ID: <CAEXv5_jUa8Av4JABoKSAueiLHSLzibMvaE-8DrVcxZHFceckMg@mail.gmail.com>
Date: Sat, 11 Feb 2017 01:42:53 -0500
From: David Windsor <dwindsor@...il.com>
To: linux-nfs@...r.kernel.org, netdev@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com, Bruce Fields <bfields@...ldses.org>,
Jeff Layton <jlayton@...chiereds.net>, Kees Cook <keescook@...omium.org>,
"Reshetova, Elena" <elena.reshetova@...el.com>, David Windsor <dwindsor@...il.com>
Subject: Re: [RFC][PATCH] nfsd: add +1 to reference counting scheme for struct nfsd4_session
<snip>
> Signed-off-by: David Windsor <dwindsor@...il.com>
> ---
> fs/nfsd/nfs4state.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index a0dee8a..b0f3010 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -196,7 +196,7 @@ static void nfsd4_put_session_locked(struct nfsd4_session *ses)
>
> lockdep_assert_held(&nn->client_lock);
>
> - if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
> + if (!atomic_add_unless(&ses->se_ref, -1, 1) && is_session_des(ses))
This should read:
if (!atomic_add_unless(&ses->se_ref, -1, 1) && is_session_dead(ses))
> free_session(ses);
> put_client_renew_locked(clp);
> }
> @@ -1645,7 +1645,7 @@ static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, stru
> new->se_flags = cses->flags;
> new->se_cb_prog = cses->callback_prog;
> new->se_cb_sec = cses->cb_sec;
> - atomic_set(&new->se_ref, 0);
> + atomic_set(&new->se_ref, 1);
> idx = hash_sessionid(&new->se_sessionid);
> list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
> spin_lock(&clp->cl_lock);
> @@ -1792,7 +1792,7 @@ free_client(struct nfs4_client *clp)
> ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
> se_perclnt);
> list_del(&ses->se_perclnt);
> - WARN_ON_ONCE(atomic_read(&ses->se_ref));
> + WARN_ON_ONCE((atomic_read(&ses->se_ref) > 1));
> free_session(ses);
> }
> rpc_destroy_wait_queue(&clp->cl_cb_waitq);
> --
> 2.7.4
>
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