linux-kernel - [PATCH 4.3] vrf: Fix memory leak on registration failure in vrf

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Date:	Tue, 15 Dec 2015 15:12:43 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	David Ahern <dsa@...ulusnetworks.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.3] vrf: Fix memory leak on registration failure in
 vrf_newlink()

The backported version of commit 7f109f7cc371 ("vrf: fix double free
and memory corruption on register_netdevice failure") incorrectly
removed a kfree() from the failure path as well as the free_netdev().
Add that back.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/vrf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index c9e309c..6c25fd0 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -581,6 +581,7 @@ static int vrf_newlink(struct net *src_net, struct net_device *dev,
 {
 	struct net_vrf *vrf = netdev_priv(dev);
 	struct net_vrf_dev *vrf_ptr;
+	int err;
 
 	if (!data || !data[IFLA_VRF_TABLE])
 		return -EINVAL;
@@ -598,7 +599,10 @@ static int vrf_newlink(struct net *src_net, struct net_device *dev,
 
 	rcu_assign_pointer(dev->vrf_ptr, vrf_ptr);
 
-	return register_netdev(dev);
+	err = register_netdev(dev);
+	if (err)
+		kfree(vrf_ptr);
+	return err;
 }
 
 static size_t vrf_nl_getsize(const struct net_device *dev)

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