netdev - Re: [PATCH 3.19 and earlier] fib_rules: Fix dump

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Message-ID: <3579656.ISPokoglEp@storm>
Date:	Fri, 09 Oct 2015 16:33:56 +0200
From:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
To:	Roland Dreier <roland@...nel.org>
Cc:	netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 3.19 and earlier] fib_rules: Fix dump_rules() not to exit early

Hi Roland,

On Monday, 5. October 2015 10:29:28 Roland Dreier wrote:
> From: Roland Dreier <roland@...estorage.com>
> 
> Backports of 41fc014332d9 ("fib_rules: fix fib rule dumps across
> multiple skbs") introduced a regression in "ip rule show" - it ends up
> dumping the first rule over and over and never exiting, because 3.19
> and earlier are missing commit 053c095a82cf ("netlink: make
> nlmsg_end() and genlmsg_end() void"), so fib_nl_fill_rule() ends up
> returning skb->len (i.e. > 0) in the success case.
> 
> Fix this by checking the return code for < 0 instead of != 0.

thanks for this fix. You just saved me an afternoon of bisecting :)

I can confirm that this fixes the mentioned issue introduced in 3.14.54.
We have an automated ipsec VPN test that failed after the upgrade:
The "ip rule list" command was hanging forever.

Cheers,
Thomas

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