From: Jacob Wen <jian.w....@oracle.com>
Date: Thu, 31 Jan 2019 15:18:56 +0800
> The size of L2TPv2 header with all optional fields is 14 bytes.
> l2tp_udp_recv_core only moves 10 bytes to the linear part of a
> skb. This may lead to l2tp_recv_common read data outside of a skb.
>
> This patch make sure that there is at least 14 bytes in the linear
> part of a skb to meet the maximum need of l2tp_udp_recv_core and
> l2tp_recv_common. The minimum size of both PPP HDLC-like frame and
> Ethernet frame is larger than 14 bytes, so we are safe to do so.
>
> Also remove L2TP_HDR_SIZE_NOSEQ, it is unused now.
>
> Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp
> parts")
> Suggested-by: Guillaume Nault <gna...@redhat.com>
> Signed-off-by: Jacob Wen <jian.w....@oracle.com>
Applied and queued up for -stable, thanks.
