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| author | Paolo Abeni <pabeni@redhat.com> | 2019-11-26 14:55:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-05 11:21:30 +0300 |
| commit | ae0ab39570fbb2a37690f70f2d93dfb2ddebdf3d (patch) | |
| tree | 93dcdc2c375b38a57ddad11e6d294d59b5644409 | |
| parent | 4f8bd02b6f6715cc06e5725a9a9ce7835bcfd958 (diff) | |
| download | linux-ae0ab39570fbb2a37690f70f2d93dfb2ddebdf3d.tar.xz | |
openvswitch: fix flow command message size
[ 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>
| -rw-r--r-- | net/openvswitch/datapath.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index c297fe8afdfe..cb2968b975a3 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -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)) |