From: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Date: Sat, 22 Aug 2020 15:06:36 +0300
> Currently the nexthop code will use an empty NHA_GROUP attribute, but it
> requires at least 1 entry in order to function properly. Otherwise we
> end up derefencing null or random pointers all over the place due to not
> having any nh_grp_entry members allocated, nexthop code relies on having at
> least the first member present. Empty NHA_GROUP doesn't make any sense so
> just disallow it.
> Also add a WARN_ON for any future users of nexthop_create_group().
...
> CC: David Ahern <dsah...@gmail.com>
> Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
> Reported-by: syzbot+a61aa19b0c14c8770...@syzkaller.appspotmail.com
> Signed-off-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Applied and queued up for -stable, thanks.
