From: Linus Lüssing <linus.luessing@xxxxxxxxx>
Date: Wed, 4 May 2016 17:25:02 +0200
> With the newly introduced helper functions the skb pulling is hidden
> in the checksumming function - and undone before returning to the
> caller.
>
> The IGMP and MLD query parsing functions in the bridge still
> assumed that the skb is pointing to the beginning of the IGMP/MLD
> message while it is now kept at the beginning of the IPv4/6 header.
>
> If there is a querier somewhere else, then this either causes
> the multicast snooping to stay disabled even though it could be
> enabled. Or, if we have the querier enabled too, then this can
> create unnecessary IGMP / MLD query messages on the link.
>
> Fixing this by taking the offset between IP and IGMP/MLD header into
> account, too.
>
> Fixes: 9afd85c9e455 ("net: Export IGMP/MLD message validation code")
> Reported-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Linus Lüssing <linus.luessing@xxxxxxxxx>
Applied and queued up for -stable, thanks.
