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@vger.kernel.org
Fixes: 7d9e5f422150 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.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 <redacted>