linux-kernel - [PATCH] cx82310_eth: fix a memory leak bug

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Date:   Wed, 14 Aug 2019 13:03:38 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steve Winslow <swinslow@...il.com>,
        Jilayne Lovejoy <opensource@...ayne.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:USB NETWORKING DRIVERS),
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] cx82310_eth: fix a memory leak bug

In cx82310_bind(), 'dev->partial_data' is allocated through kmalloc().
Then, the execution waits for the firmware to become ready. If the firmware
is not ready in time, the execution is terminated. However, the allocated
'dev->partial_data' is not deallocated on this path, leading to a memory
leak bug. To fix this issue, free 'dev->partial_data' before returning the
error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 drivers/net/usb/cx82310_eth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/cx82310_eth.c b/drivers/net/usb/cx82310_eth.c
index 5519248..32b08b1 100644
--- a/drivers/net/usb/cx82310_eth.c
+++ b/drivers/net/usb/cx82310_eth.c
@@ -163,7 +163,8 @@ static int cx82310_bind(struct usbnet *dev, struct usb_interface *intf)
 	}
 	if (!timeout) {
 		dev_err(&udev->dev, "firmware not ready in time\n");
-		return -ETIMEDOUT;
+		ret = -ETIMEDOUT;
+		goto err;
 	}
 
 	/* enable ethernet mode (?) */
-- 
2.7.4