ipv6: do not free rt if FIB_LOOKUP_NOREF is set on suppress rule

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Commit 7d9e5f4221 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.

Fixes: 7d9e5f4221 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Jason A. Donenfeld 2019-09-24 16:01:28 +02:00 • committed by David S. Miller

parent ea8564c865

commit ca7a03c417

2 changed files with 18 additions and 2 deletions

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net/ipv6/fib6_rules.c

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