linux-kernel - [PATCH 1/1] pcmcia: Fix resource leaks in yenta_probe() and

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Date:	Mon, 15 Jun 2015 02:43:59 +0900
From:	Takeshi Yoshimura <yos@...ab.ics.keio.ac.jp>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vaishali Thakkar <vthakkar1994@...il.com>,
	linux-pcmcia@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Takeshi Yoshimura <yos@...ab.ics.keio.ac.jp>
Subject: [PATCH 1/1] pcmcia: Fix resource leaks in yenta_probe() and _close()

There are some resource leaks in yenta_probe() and _close(). I fixed
the following issues with some code cleanups. Thanks to Dominik's
suggestions.

On the error path in yenta_probe():
- a requested irq is not released
- yenta_free_resources() and pci_set_drvdata(dev, NULL) are not called

In yenta_close():
- kfree(sock) is not called
- sock->base is always set to non-NULL when yenta_close() is called,
  therefore the check in yenta_close() is not necessary.

Signed-off-by: Takeshi Yoshimura <yos@...ab.ics.keio.ac.jp>
---
 drivers/pcmcia/yenta_socket.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 965bd84..440ccde 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -802,13 +802,13 @@ static void yenta_close(struct pci_dev *dev)
 	else
 		del_timer_sync(&sock->poll_timer);
 
-	if (sock->base)
-		iounmap(sock->base);
+	iounmap(sock->base);
 	yenta_free_resources(sock);
 
 	pci_release_regions(dev);
 	pci_disable_device(dev);
 	pci_set_drvdata(dev, NULL);
+	kfree(sock);
 }
 
 
@@ -1259,25 +1259,34 @@ static int yenta_probe(struct pci_dev *dev, const struct pci_device_id *id)
 
 	/* Register it with the pcmcia layer.. */
 	ret = pcmcia_register_socket(&socket->socket);
-	if (ret == 0) {
-		/* Add the yenta register attributes */
-		ret = device_create_file(&dev->dev, &dev_attr_yenta_registers);
-		if (ret == 0)
-			goto out;
-
-		/* error path... */
-		pcmcia_unregister_socket(&socket->socket);
-	}
+	if (ret)
+		goto free_irq;
+
+	/* Add the yenta register attributes */
+	ret = device_create_file(&dev->dev, &dev_attr_yenta_registers);
+	if (ret)
+		goto unregister_socket;
 
+	return ret;
+
+	/* error path... */
+ unregister_socket:
+	pcmcia_unregister_socket(&socket->socket);
+ free_irq:
+	if (socket->cb_irq)
+		free_irq(socket->cb_irq, socket);
+	else
+		del_timer_sync(&socket->poll_timer);
  unmap:
 	iounmap(socket->base);
+	yenta_free_resources(socket);
  release:
 	pci_release_regions(dev);
  disable:
 	pci_disable_device(dev);
  free:
+	pci_set_drvdata(dev, NULL);
 	kfree(socket);
- out:
 	return ret;
 }
 
-- 
1.9.1

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