linux-kernel - Re: [PATCH 4.4 106/124] netlink: Do not subscribe to non-existent groups

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Message-Id: <20180804.163348.896647113172060665.davem@davemloft.net>
Date:   Sat, 04 Aug 2018 16:33:48 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dima@...sta.com
Cc:     natechancellor@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        herbert@...dor.apana.org.au, steffen.klassert@...unet.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH 4.4 106/124] netlink: Do not subscribe to non-existent
 groups

From: Dmitry Safonov <dima@...sta.com>
Date: Sun, 05 Aug 2018 00:26:38 +0100

> Thanks for the testing, sorry again for the breakage.
> Will send the patch shortly (with sizeof(unsigned long long) instead of
> hard-coded 64). Hopefully, not too late.

'groups' is "long unsigned int" not "unsigned long long"

	long unsigned int groups = nladdr->nl_groups;

And nladdr->nl_groups is specified as "__u32"

So the size of the relevant bits is actually strictly 32-bit.

This makes also the "ULL" in your constant specification incorrect as
well.

So much crazy stuff going on here :-/