git: 5324cf4f1cf9 - stable/13 - pf: fix sctp deadlock
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Date: Wed, 17 Jul 2024 21:55:27 UTC
The branch stable/13 has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=5324cf4f1cf9d93351f966d4a76cf0389d08f3c6 commit 5324cf4f1cf9d93351f966d4a76cf0389d08f3c6 Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2024-07-09 18:49:49 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2024-07-17 21:54:35 +0000 pf: fix sctp deadlock It is possible for pf_test_state_sctp() to find a state and still return PF_DROP (or not PF_PASS, to be exact). In that case we would run pf_test_rule() unconditionally, but this would overwrite the (locked!) state pointer pf_test_state_sctp() gave us. As a result we will later deadlock, trying the lock the already locked state. Do what we do for UDP and TCP, and explicitly check s for NULL before we run pf_test_rule(). MFC after: 1 week Sponsored by: Orange Business Services (cherry picked from commit a9639adaedb4d67340c4ae386fe8fcd18e4a8a21) --- sys/netpfil/pf/pf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index 97ae44cff69f..e99886a2d120 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -7310,7 +7310,7 @@ pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb * V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; - } else { + } else if (s == NULL) { action = pf_test_rule(&r, &s, pd.dir, kif, m, off, &pd, &a, &ruleset, inp); } @@ -7838,7 +7838,7 @@ pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; - } else { + } else if (s == NULL) { action = pf_test_rule(&r, &s, pd.dir, kif, m, off, &pd, &a, &ruleset, inp); }