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From: Kangjie Lu <kjlu@umn.edu>
To: kjlu@umn.edu
Cc: pakki001@umn.edu, Matt Porter <mporter@kernel.crashing.org>,
	Alexandre Bounine <alex.bou9@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] rapidio: fix a NULL pointer derefenrece when create_workqueue fails
Date: Thu, 14 Mar 2019 01:10:15 -0500	[thread overview]
Message-ID: <20190314061015.11291-1-kjlu@umn.edu> (raw)

In case create_workqueue fails, the fix releases resources and
returns -ENOMEM to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
 drivers/rapidio/rio_cm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/rapidio/rio_cm.c b/drivers/rapidio/rio_cm.c
index cf45829585cb..b29fc258eeba 100644
--- a/drivers/rapidio/rio_cm.c
+++ b/drivers/rapidio/rio_cm.c
@@ -2147,6 +2147,14 @@ static int riocm_add_mport(struct device *dev,
 	mutex_init(&cm->rx_lock);
 	riocm_rx_fill(cm, RIOCM_RX_RING_SIZE);
 	cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
+	if (!cm->rx_wq) {
+		riocm_error("failed to allocate IBMBOX_%d on %s",
+			    cmbox, mport->name);
+		rio_release_outb_mbox(mport, cmbox);
+		kfree(cm);
+		return -ENOMEM;
+	}
+
 	INIT_WORK(&cm->rx_work, rio_ibmsg_handler);
 
 	cm->tx_slot = 0;
-- 
2.17.1


             reply	other threads:[~2019-03-14  6:10 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-14  6:10 Kangjie Lu [this message]
2019-03-18 22:44 ` [PATCH] rapidio: fix a NULL pointer derefenrece when create_workqueue fails alex.bou9
2019-03-18 22:46 ` alex.bou9

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