From: Willem de Bruijn <willemdebruijn.ker...@gmail.com>
Date: Tue, 8 Mar 2016 15:18:54 -0500
> From: Willem de Bruijn <will...@google.com>
>
> The stack expects link layer headers in the skb linear section.
> Macvtap can create skbs with llheader in frags in edge cases:
> when (IFF_VNET_HDR is off or vnet_hdr.hdr_len < ETH_HLEN) and
> prepad + len > PAGE_SIZE and vnet_hdr.flags has no or bad csum.
>
> Add checks to ensure linear is always at least ETH_HLEN.
> At this point, len is already ensured to be >= ETH_HLEN.
>
> For backwards compatiblity, rounds up short vnet_hdr.hdr_len.
> This differs from tap and packet, which return an error.
>
> Fixes b9fb9ee07e67 ("macvtap: add GSO/csum offload support")
> Signed-off-by: Willem de Bruijn <will...@google.com>
Applied to net-next and queued up for -stable, thanks.
