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| author | Ian Wienand <iwienand@redhat.com> | 2016-08-03 07:44:57 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-08-06 06:06:11 +0200 |
| commit | 5ef9f289c4e698054e5687edb54f0da3cdc9173a (patch) | |
| tree | 917fe7b0dcabc632616371adae06a06ac550ae2d | |
| parent | Merge branch 'qlcnic-fixes' (diff) | |
| download | linux-5ef9f289c4e698054e5687edb54f0da3cdc9173a.tar.xz linux-5ef9f289c4e698054e5687edb54f0da3cdc9173a.zip | |
OVS: Ignore negative headroom value
net_device->ndo_set_rx_headroom (introduced in
871b642adebe300be2e50aa5f65a418510f636ec) says
"Setting a negtaive value reset the rx headroom
to the default value".
It seems that the OVS implementation in
3a927bc7cf9d0fbe8f4a8189dd5f8440228f64e7 overlooked this and sets
dev->needed_headroom unconditionally.
This doesn't have an immediate effect, but can mess up later
LL_RESERVED_SPACE calculations, such as done in
net/ipv6/mcast.c:mld_newpack. For reference, this issue was found
from a skb_panic raised there after the length calculations had given
the wrong result.
Note the other current users of this interface
(drivers/net/tun.c:tun_set_headroom and
drivers/net/veth.c:veth_set_rx_headroom) are both checking this
correctly thus need no modification.
Thanks to Ben for some pointers from the crash dumps!
Cc: Benjamin Poirier <bpoirier@suse.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1361414
Signed-off-by: Ian Wienand <iwienand@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/openvswitch/vport-internal_dev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c index 434e04c3a189..95c36147a6e1 100644 --- a/net/openvswitch/vport-internal_dev.c +++ b/net/openvswitch/vport-internal_dev.c @@ -140,7 +140,7 @@ internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats) static void internal_set_rx_headroom(struct net_device *dev, int new_hr) { - dev->needed_headroom = new_hr; + dev->needed_headroom = new_hr < 0 ? 0 : new_hr; } static const struct net_device_ops internal_dev_netdev_ops = { |