netdev - [PATCH net-next v2 1/2] usbnet: ipheth: fix risk of NULL pointer deallocation

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Message-Id: <20230525194255.4516-1-forst@pen.gy>
Date: Thu, 25 May 2023 21:42:54 +0200
From: Foster Snowhill <forst@....gy>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Georgi Valkov <gvalkov@...il.com>,
	Simon Horman <simon.horman@...igine.com>,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next v2 1/2] usbnet: ipheth: fix risk of NULL pointer deallocation

From: Georgi Valkov <gvalkov@...il.com>

The cleanup precedure in ipheth_probe will attempt to free a
NULL pointer in dev->ctrl_buf if the memory allocation for
this buffer is not successful. Rearrange the goto labels to
avoid this risk.

Signed-off-by: Georgi Valkov <gvalkov@...il.com>
---
 drivers/net/usb/ipheth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
index 6a769df0b..8875a3d0e 100644
--- a/drivers/net/usb/ipheth.c
+++ b/drivers/net/usb/ipheth.c
@@ -510,8 +510,8 @@ static int ipheth_probe(struct usb_interface *intf,
 	ipheth_free_urbs(dev);
 err_alloc_urbs:
 err_get_macaddr:
-err_alloc_ctrl_buf:
 	kfree(dev->ctrl_buf);
+err_alloc_ctrl_buf:
 err_endpoints:
 	free_netdev(netdev);
 	return retval;
-- 
2.40.1