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	Fri, 19 Oct 2012 15:39:54 -0400
Date: Fri, 19 Oct 2012 15:39:51 -0400
To: bjschuma@netapp.com
Cc: Trond.Myklebust@netapp.com, linux-nfs@vger.kernel.org,
        stable@vger.kernel.org
Subject: Re: [PATCH] SUNRPC: Set alloc_slot for backchannel tcp ops
Message-ID: <20121019193951.GA30593@fieldses.org>
References: <1348508341-19642-1-git-send-email-bjschuma@netapp.com>
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In-Reply-To: <1348508341-19642-1-git-send-email-bjschuma@netapp.com>
From: "J. Bruce Fields" <bfields@fieldses.org>
Sender: linux-nfs-owner@vger.kernel.org
List-ID: <linux-nfs.vger.kernel.org>

Did this not get sent to stable?  (Now upstream as
84e28a307e376f271505af65a7b7e212dd6f61f4.)

--b.

On Mon, Sep 24, 2012 at 01:39:01PM -0400, bjschuma@netapp.com wrote:
> From: Bryan Schumaker <bjschuma@netapp.com>
> 
> f39c1bfb5a03e2d255451bff05be0d7255298fa4 (SUNRPC: Fix a UDP transport
> regression) introduced the "alloc_slot" function for xprt operations,
> but never created one for the backchannel operations.  This patch fixes
> a null pointer dereference when mounting NFS over v4.1.
> 
> Call Trace:
>  [<ffffffffa0207957>] ? xprt_reserve+0x47/0x50 [sunrpc]
>  [<ffffffffa02023a4>] call_reserve+0x34/0x60 [sunrpc]
>  [<ffffffffa020e280>] __rpc_execute+0x90/0x400 [sunrpc]
>  [<ffffffffa020e61a>] rpc_async_schedule+0x2a/0x40 [sunrpc]
>  [<ffffffff81073589>] process_one_work+0x139/0x500
>  [<ffffffff81070e70>] ? alloc_worker+0x70/0x70
>  [<ffffffffa020e5f0>] ? __rpc_execute+0x400/0x400 [sunrpc]
>  [<ffffffff81073d1e>] worker_thread+0x15e/0x460
>  [<ffffffff8145c839>] ? preempt_schedule+0x49/0x70
>  [<ffffffff81073bc0>] ? rescuer_thread+0x230/0x230
>  [<ffffffff81079603>] kthread+0x93/0xa0
>  [<ffffffff81465d04>] kernel_thread_helper+0x4/0x10
>  [<ffffffff81079570>] ? kthread_freezable_should_stop+0x70/0x70
>  [<ffffffff81465d00>] ? gs_change+0x13/0x13
> 
> Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
> ---
>  net/sunrpc/xprtsock.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
> index 86b7777..aaaadfb 100644
> --- a/net/sunrpc/xprtsock.c
> +++ b/net/sunrpc/xprtsock.c
> @@ -2521,6 +2521,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
>  static struct rpc_xprt_ops bc_tcp_ops = {
>  	.reserve_xprt		= xprt_reserve_xprt,
>  	.release_xprt		= xprt_release_xprt,
> +	.alloc_slot		= xprt_alloc_slot,
>  	.rpcbind		= xs_local_rpcbind,
>  	.buf_alloc		= bc_malloc,
>  	.buf_free		= bc_free,
> -- 
> 1.7.12.1
> 
> --
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