linux-kernel - [PATCH 3/6] VMCI: Fix deref before NULL-check of queuepair ptr

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Date:	Thu, 10 Jan 2013 15:41:40 -0800
From:	Dmitry Torokhov <dtor@...are.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, pv-drivers@...are.com
Subject: [PATCH 3/6] VMCI: Fix deref before NULL-check of queuepair ptr

From: Andy King <acking@...are.com>

Check for a valid queuepair ptr before trying to lock the queuepair (which will
deref it).

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Andy King <acking@...are.com>
Signed-off-by: Dmitry Torokhov <dtor@...are.com>
---
 drivers/misc/vmw_vmci/vmci_queue_pair.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index da47e45..6417a26 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -3355,11 +3355,11 @@ ssize_t vmci_qpair_dequev(struct vmci_qp *qpair,
 {
 	ssize_t result;
 
-	qp_lock(qpair);
-
 	if (!qpair || !iov)
 		return VMCI_ERROR_INVALID_ARGS;
 
+	qp_lock(qpair);
+
 	do {
 		result = qp_dequeue_locked(qpair->produce_q,
 					   qpair->consume_q,
-- 
1.7.4.1

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