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

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Message-Id: <20170619.142548.1263352241205374623.davem@davemloft.net>
Date:   Mon, 19 Jun 2017 14:25:48 -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: Fri, 16 Jun 2017 14:42:17 +0300

> While commit 73ba57b (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 loosing reference on throw
> route stored previously forever.
> 
> We also partially revert commit ab997ad (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: 73ba57b (ipv6: fix backtracking for throw routes)
> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>

This does not apply cleanly to the net tree, please respin.