linux-kernel - [PATCH 3.11 092/182] nfsd4: session needs room for following op to error out

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Message-Id: <1398329507-5911-93-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 24 Apr 2014 09:50:17 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"J. Bruce Fields" <bfields@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 092/182] nfsd4: session needs room for following op to error out

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

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

From: "J. Bruce Fields" <bfields@...hat.com>

commit 4c69d5855a16f7378648c5733632628fa10431db upstream.

Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/nfsd/nfs4proc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 419572f..622ede1 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1349,6 +1349,12 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
 		/* If op is non-idempotent */
 		if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
 			plen = opdesc->op_rsize_bop(rqstp, op);
+			/*
+			 * If there's still another operation, make sure
+			 * we'll have space to at least encode an error:
+			 */
+			if (resp->opcnt < args->opcnt)
+				plen += COMPOUND_ERR_SLACK_SPACE;
 			op->status = nfsd4_check_resp_size(resp, plen);
 		}
 
-- 
1.9.1

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