[ovs-dev] [PATCH] datapath: Immediately exit on error in ovs_vport_cmd_set().

[Jesse Gross]

It is an error to try to change the type of a vport using the set
command. However, while we check that this is an error, we still
proceed to allocate memory which then gets freed immediately.
This stops processing after noticing the error, which does not
actually fix a bug but is more correct.

Signed-off-by: Jesse Gross <jesse at nicira.com>
---
 datapath/datapath.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/datapath/datapath.c b/datapath/datapath.c
index cf901d2..c0b8849 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -2107,8 +2107,10 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = 0;
 	if (a[OVS_VPORT_ATTR_TYPE] &&
-	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
+	    nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
 		err = -EINVAL;
+		goto exit_unlock;
+	}
 
 	reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!reply) {
-- 
1.7.10.4