linux-kernel - [064/156] nfsd: ensure sockets are closed on error

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Date:	Tue, 30 Mar 2010 15:41:38 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [064/156] nfsd: ensure sockets are closed on error

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Neil Brown <neilb@...e.de>

commit 301e99ce4a2f42a317129230fd42e6cd874c64b0 upstream.

One the changes in commit d7979ae4a "svc: Move close processing to a
single place" is:

  err_delete:
-       svc_delete_socket(svsk);
+       set_bit(SK_CLOSE, &svsk->sk_flags);
        return -EAGAIN;

This is insufficient. The recvfrom methods must always call
svc_xprt_received on completion so that the socket gets re-queued if
there is any more work to do.  This particular path did not make that
call because it actually destroyed the svsk, making requeue pointless.
When the svc_delete_socket was change to just set a bit, we should have
added a call to svc_xprt_received,

This is the problem that b0401d7253 attempted to fix, incorrectly.

Signed-off-by: J. Bruce Fields <bfields@...i.umich.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/sunrpc/svcsock.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -968,6 +968,7 @@ static int svc_tcp_recv_record(struct sv
 	return len;
  err_delete:
 	set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
+	svc_xprt_received(&svsk->sk_xprt);
  err_again:
 	return -EAGAIN;
 }

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