From: "Jason A. Donenfeld" Jason@zx2c4.com Date: Tue, 24 Sep 2019 09:36:15 +0200
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 in the link of this commit reliably triggers various crashes due to the use-after-free caused by the reference underflow.
Cc: stable@vger.kernel.org Fixes: 7d9e5f422150 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF") Test-case: https://git.zx2c4.com/WireGuard/commit/?id=ad66532000f7a20b149e47c5eb3a95736... Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com
Please make such test cases integratabe into the selftests area for networking and submit it along with this fix.
Otherwise this code will regress.
Thank you.