From: Paolo Abeni pabeni@redhat.com
[ Upstream commit 4e81c0b3fa93d07653e2415fa71656b080a112fd ]
When user-space sets the OVS_UFID_F_OMIT_* flags, and the relevant flow has no UFID, we can exceed the computed size, as ovs_nla_put_identifier() will always dump an OVS_FLOW_ATTR_KEY attribute. Take the above in account when computing the flow command message size.
Fixes: 74ed7ab9264c ("openvswitch: Add support for unique flow IDs.") Reported-by: Qi Jun Ding qding@redhat.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/openvswitch/datapath.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -704,9 +704,13 @@ static size_t ovs_flow_cmd_msg_size(cons { size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
- /* OVS_FLOW_ATTR_UFID */ + /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback + * see ovs_nla_put_identifier() + */ if (sfid && ovs_identifier_is_ufid(sfid)) len += nla_total_size(sfid->ufid_len); + else + len += nla_total_size(ovs_key_attr_size());
/* OVS_FLOW_ATTR_KEY */ if (!sfid || should_fill_key(sfid, ufid_flags))