From: Bjørn Mork <bj...@mork.no>
Date: Tue, 17 Apr 2018 22:46:38 +0200
> Bogus trimming in tun_net_xmit() causes truncated vlan packets.
>
> skb->len is correct whether or not skb_vlan_tag_present() is true. There
> is no more reason to adjust the skb length on xmit in this driver than
> any other driver. tun_put_user() adds 4 bytes to the total for tagged
> packets because it transmits the tag inline to userspace. This is
> similar to a nic transmitting the tag inline on the wire.
>
> Reproducing the bug by sending any tagged packet through back-to-back
> connected tap interfaces:
...
> Fixes: aff3d70a07ff ("tun: allow to attach ebpf socket filter")
> Cc: Jason Wang <jasow...@redhat.com>
> Signed-off-by: Bjørn Mork <bj...@mork.no>
Applied and queued up for -stable, thanks.
