netdev - Re: ipv6: Do not leak throw route references

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Date:   Tue, 20 Jun 2017 15:35:50 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     serhe.popovych@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: ipv6: Do not leak throw route references

From: Serhey Popovych <serhe.popovych@...il.com>
Date: Tue, 20 Jun 2017 13:29:25 +0300

> While commit 73ba57bfae4a ("ipv6: fix backtracking for throw routes")
> does good job on error propagation to the fib_rules_lookup()
> in fib rules core framework that also corrects throw routes
> handling, it does not solve route reference leakage problem
> happened when we return -EAGAIN to the fib_rules_lookup()
> and leave routing table entry referenced in arg->result.
> 
> If rule with matched throw route isn't last matched in the
> list we overwrite arg->result losing reference on throw
> route stored previously forever.
> 
> We also partially revert commit ab997ad40839 ("ipv6: fix the
> incorrect return value of throw route") since we never return
> routing table entry with dst.error == -EAGAIN when
> CONFIG_IPV6_MULTIPLE_TABLES is on. Also there is no point
> to check for RTF_REJECT flag since it is always set throw
> route.
> 
> Fixes: 73ba57bfae4a ("ipv6: fix backtracking for throw routes")
> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
> ---
> v2: Rebased to kernel/git/davem/net.git repository
>     Address several scripts/checkpatch.pl issues.

Applied and queue up for -stable, thanks.