linux-kernel - [PATCH v2 04/11] hso: fix memory leak in hso_create

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Message-Id: <1422620523-15021-5-git-send-email-olivier@sobrie.be>
Date:	Fri, 30 Jan 2015 13:21:56 +0100
From:	Olivier Sobrie <olivier@...rie.be>
To:	Jan Dumon <j.dumon@...ion.com>, Dan Williams <dcbw@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, Olivier Sobrie <olivier@...rie.be>
Subject: [PATCH v2 04/11] hso: fix memory leak in hso_create_rfkill()

When the rfkill interface was created, a buffer containing the name
of the rfkill node was allocated. This buffer was never freed when the
device disappears.

To fix the problem, we put the name given to rfkill_alloc() in
the hso_net structure.

Signed-off-by: Olivier Sobrie <olivier@...rie.be>
---
 drivers/net/usb/hso.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 470ef9e..a49ac2e 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -153,6 +153,7 @@ struct hso_net {
 	struct hso_device *parent;
 	struct net_device *net;
 	struct rfkill *rfkill;
+	char name[8];
 
 	struct usb_endpoint_descriptor *in_endp;
 	struct usb_endpoint_descriptor *out_endp;
@@ -2467,27 +2468,20 @@ static void hso_create_rfkill(struct hso_device *hso_dev,
 {
 	struct hso_net *hso_net = dev2net(hso_dev);
 	struct device *dev = &hso_net->net->dev;
-	char *rfkn;
 
-	rfkn = kzalloc(20, GFP_KERNEL);
-	if (!rfkn)
-		dev_err(dev, "%s - Out of memory\n", __func__);
-
-	snprintf(rfkn, 20, "hso-%d",
+	snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
 		 interface->altsetting->desc.bInterfaceNumber);
 
-	hso_net->rfkill = rfkill_alloc(rfkn,
+	hso_net->rfkill = rfkill_alloc(hso_net->name,
 				       &interface_to_usbdev(interface)->dev,
 				       RFKILL_TYPE_WWAN,
 				       &hso_rfkill_ops, hso_dev);
 	if (!hso_net->rfkill) {
 		dev_err(dev, "%s - Out of memory\n", __func__);
-		kfree(rfkn);
 		return;
 	}
 	if (rfkill_register(hso_net->rfkill) < 0) {
 		rfkill_destroy(hso_net->rfkill);
-		kfree(rfkn);
 		hso_net->rfkill = NULL;
 		dev_err(dev, "%s - Failed to register rfkill\n", __func__);
 		return;
-- 
2.2.0

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