netdev - Re: [PATCH net v2] net: nexthop: don't allow empty NHA

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Date:   Sat, 22 Aug 2020 12:42:09 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     nikolay@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, dsahern@...il.com,
        syzbot+a61aa19b0c14c8770bd9@...kaller.appspotmail.com
Subject: Re: [PATCH net v2] net: nexthop: don't allow empty NHA_GROUP

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.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 <dsahern@...il.com>
> Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
> Reported-by: syzbot+a61aa19b0c14c8770bd9@...kaller.appspotmail.com
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Applied and queued up for -stable, thanks.