From: Lorenzo Bianconi <lore...@kernel.org>
Date: Fri, 31 Jul 2020 20:12:05 +0200
> The GRE tunnel can be used to transport traffic that does not rely on a
> Internet checksum (e.g. SCTP). The issue can be triggered creating a GRE
> or GRETAP tunnel and transmitting SCTP traffic ontop of it where CRC
> offload has been disabled. In order to fix the issue we need to
> recompute the GRE csum in gre_gso_segment() not relying on the inner
> checksum.
> The issue is still present when we have the CRC offload enabled.
> In this case we need to disable the CRC offload if we require GRE
> checksum since otherwise skb_checksum() will report a wrong value.
>
> Fixes: 4749c09c37030 ("gre: Call gso_make_checksum")
> Signed-off-by: Lorenzo Bianconi <lore...@kernel.org>
Applied with Fixes: tag corrected and queued up for -stable.
Thanks.
