Re: [PATCH v2] ipv6: do not free rt if FIB_LOOKUP_NOREF is set on suppress rule

[David Ahern]

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@xxxxxxxxxxxxxxx
> Fixes: 7d9e5f422150 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF")
> Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
> ---
>  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@xxxxxxxxx>