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From: Leon Romanovsky <leon@kernel.org>
To: Trond Myklebust <trondmy@hammerspace.com>
Cc: "tanxin.ctf@gmail.com" <tanxin.ctf@gmail.com>,
	"xiyuyang19@fudan.edu.cn" <xiyuyang19@fudan.edu.cn>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"chuck.lever@oracle.com" <chuck.lever@oracle.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"kolga@netapp.com" <kolga@netapp.com>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"bfields@fieldses.org" <bfields@fieldses.org>,
	"anna.schumaker@netapp.com" <anna.schumaker@netapp.com>,
	"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"yuanxzhang@fudan.edu.cn" <yuanxzhang@fudan.edu.cn>
Subject: Re: [PATCH] SUNRPC: Convert from atomic_t to refcount_t on rpc_clnt->cl_count
Date: Sun, 18 Jul 2021 13:47:08 +0300	[thread overview]
Message-ID: <YPQGrMEuZ2q4JhgW@unreal> (raw)
In-Reply-To: <1f12b3569565fa8590b45cc2fbe7c176ca7c5184.camel@hammerspace.com>

On Sat, Jul 17, 2021 at 02:43:26PM +0000, Trond Myklebust wrote:
> On Sat, 2021-07-17 at 18:18 +0800, Xiyu Yang wrote:
> > refcount_t type and corresponding API can protect refcounters from
> > accidental underflow and overflow and further use-after-free
> > situations.
> > 
> 
> Have you tested this patch? As far as I remember, the reason why we
> never converted is that refcount_inc() gets upset and WARNs when you
> bump a zero refcount, like we do very much on purpose in
> rpc_free_auth(). Is that no longer the case?

It is still the case, they sent gazillion conversion patches with same
mistake.

Thanks

> 
> 
> -- 
> Trond Myklebust
> Linux NFS client maintainer, Hammerspace
> trond.myklebust@hammerspace.com
> 
> 

      parent reply	other threads:[~2021-07-18 10:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-17 10:18 Xiyu Yang
2021-07-17 14:43 ` Trond Myklebust
2021-07-17 16:32   ` Xiyu Yang
2021-07-18 10:47   ` Leon Romanovsky [this message]

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