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openvswitch: fix flow command message size

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[ 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: 74ed7ab926 ("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>
This commit is contained in:
Paolo Abeni 2019-11-26 12:55:50 +01:00 committed by Greg Kroah-Hartman
parent 4f8bd02b6f
commit ae0ab39570
1 changed files with 5 additions and 1 deletions
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6
net/openvswitch/datapath.c
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@ -697,9 +697,13 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
{
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))