linux-kernel - [PATCH 3.18 105/150] nfsd: fix fi_delegees leak when fi_had

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Date:	Tue, 13 Jan 2015 23:22:56 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jeff Layton <jlayton@...marydata.com>,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 3.18 105/150] nfsd: fix fi_delegees leak when fi_had_conflict returns true

3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Jeff Layton <jlayton@...marydata.com>

commit 94ae1db226a5bcbb48372d81161f084c9e283fd8 upstream.

Currently, nfs4_set_delegation takes a reference to an existing
delegation and then checks to see if there is a conflict. If there is
one, then it doesn't release that reference.

Change the code to take the reference after the check and only if there
is no conflict.

Signed-off-by: Jeff Layton <jlayton@...marydata.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfsd/nfs4state.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3890,11 +3890,11 @@ nfs4_set_delegation(struct nfs4_client *
 		status = nfs4_setlease(dp);
 		goto out;
 	}
-	atomic_inc(&fp->fi_delegees);
 	if (fp->fi_had_conflict) {
 		status = -EAGAIN;
 		goto out_unlock;
 	}
+	atomic_inc(&fp->fi_delegees);
 	hash_delegation_locked(dp, fp);
 	status = 0;
 out_unlock:


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