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openvswitch: Avoid memory corruption in queue_userspace_packet() 

In queue_userspace_packet(), the ovs_nla_put_flow return value is
not checked. This is fine as long as key_attr_size() returns the
correct value. In case it does not, the current code may corrupt buffer
memory. Add a run time assertion catch this case to avoid silent
failure.

Reported-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Andy Zhou 2014-07-17 15:17:44 -07:00 committed by Pravin B Shelar
parent f6eec614d2
commit f53e38317d
1 changed files with 2 additions and 1 deletions
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3
net/openvswitch/datapath.c
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@ -464,7 +464,8 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
upcall->dp_ifindex = dp_ifindex;
nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
BUG_ON(err);
nla_nest_end(user_skb, nla);
if (upcall_info->userdata)