linux-kernel - Re: [PATCH v2] ipv6: do not free rt if FIB_LOOKUP

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Message-ID: <22ee9da6-6bc4-7f6f-d19d-1d492bfe8e7e@gmail.com>
Date:   Thu, 26 Sep 2019 08:43:47 -0600
From:   David Ahern <dsahern@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        weiwan@...gle.com
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH v2] ipv6: do not free rt if FIB_LOOKUP_NOREF is set on
 suppress rule

On 9/24/19 8:01 AM, Jason A. Donenfeld wrote:
> Commit 7d9e5f422150 removed references from certain dsts, but accounting
> for this never translated down into the fib6 suppression code. This bug
> was triggered by WireGuard users who use wg-quick(8), which uses the
> "suppress-prefix" directive to ip-rule(8) for routing all of their
> internet traffic without routing loops. The test case added here
> causes the reference underflow by causing packets to evaluate a suppress
> rule.
> 
> Cc: stable@...r.kernel.org
> Fixes: 7d9e5f422150 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF")
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
>  net/ipv6/fib6_rules.c                    |  3 ++-
>  tools/testing/selftests/net/fib_tests.sh | 17 ++++++++++++++++-
>  2 files changed, 18 insertions(+), 2 deletions(-)

Thanks for adding the test case.

Reviewed-by: David Ahern <dsahern@...il.com>