Date: Sun, 30 Nov 2025 10:30:49 +0000 From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 7d8effcf65fe - stable/15 - pf: handle divert packets Message-ID: <692c1cd9.8482.3e4056af@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=7d8effcf65fe598417924e0b314570b893b626c0 commit 7d8effcf65fe598417924e0b314570b893b626c0 Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2025-11-15 13:44:54 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2025-11-30 10:27:27 +0000 pf: handle divert packets In a divert setup pf_test_state() may return PF_PASS, but not set the state pointer. We didn't handle that, and as a result crashed immediately afterwards trying to dereference that NULL state pointer. Add a test case to provoke the problem. PR: 260867 MFC after: 2 weeks Submitted by: Phil Budne <phil.budne@gmail.com> Sponsored by: Rubicon Communications, LLC ("Netgate") (cherry picked from commit 66f2f1c83247f05a3a599d7e88c7e7efbedd16b5) --- sys/netpfil/pf/pf.c | 20 ++++++++++-------- tests/sys/netpfil/pf/divert-to.sh | 43 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+), 8 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index af0629397ea0..fa6dd41cecee 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -11020,10 +11020,12 @@ pf_test(sa_family_t af, int dir, int pflags, struct ifnet *ifp, struct mbuf **m0 break; action = pf_test_state(&s, &pd, &reason); if (action == PF_PASS || action == PF_AFRT) { - if (V_pfsync_update_state_ptr != NULL) - V_pfsync_update_state_ptr(s); - r = s->rule; - a = s->anchor; + if (s != NULL) { + if (V_pfsync_update_state_ptr != NULL) + V_pfsync_update_state_ptr(s); + r = s->rule; + a = s->anchor; + } } else if (s == NULL) { /* Validate remote SYN|ACK, re-create original SYN if * valid. */ @@ -11072,10 +11074,12 @@ pf_test(sa_family_t af, int dir, int pflags, struct ifnet *ifp, struct mbuf **m0 default: action = pf_test_state(&s, &pd, &reason); if (action == PF_PASS || action == PF_AFRT) { - if (V_pfsync_update_state_ptr != NULL) - V_pfsync_update_state_ptr(s); - r = s->rule; - a = s->anchor; + if (s != NULL) { + if (V_pfsync_update_state_ptr != NULL) + V_pfsync_update_state_ptr(s); + r = s->rule; + a = s->anchor; + } } else if (s == NULL) { action = pf_test_rule(&r, &s, &pd, &a, &ruleset, &reason, inp, &match_rules); diff --git a/tests/sys/netpfil/pf/divert-to.sh b/tests/sys/netpfil/pf/divert-to.sh index ae44cd5d51af..153136199311 100644 --- a/tests/sys/netpfil/pf/divert-to.sh +++ b/tests/sys/netpfil/pf/divert-to.sh @@ -372,6 +372,47 @@ in_dn_in_div_in_out_div_out_dn_out_cleanup() pft_cleanup } +atf_test_case "pr260867" "cleanup" +pr260867_head() +{ + atf_set descr 'Test for the loop reported in PR260867' + atf_set require.user root +} + +pr260867_body() +{ + pft_init + divert_init + + epair=$(vnet_mkepair) + + ifconfig ${epair}a 192.0.2.1/24 up + + vnet_mkjail alcatraz ${epair}b + jexec alcatraz ifconfig ${epair}b 192.0.2.2/24 up + + # Sanity check + atf_check -s exit:0 -o ignore ping -c3 192.0.2.2 + + jexec alcatraz /usr/sbin/inetd -p ${PWD}/inetd-echo.pid $(atf_get_srcdir)/echo_inetd.conf + jexec alcatraz $(atf_get_srcdir)/../common/divapp 1001 divert-back & + + jexec alcatraz pfctl -e + pft_set_rules alcatraz \ + "pass in on ${epair}b proto tcp from any to port 7 divert-to 0.0.0.0 port 1001" + + reply=$(echo "foo" | nc -N 192.0.2.2 7) + if ["${reply}" != "foo" ]; + then + atf_fail "Did not receive echo reply" + fi +} + +pr260867_cleanup() +{ + pft_cleanup +} + atf_init_test_cases() { atf_add_test_case "in_div" @@ -383,4 +424,6 @@ atf_init_test_cases() atf_add_test_case "in_div_in_fwd_out_div_out" atf_add_test_case "in_dn_in_div_in_out_div_out_dn_out" + + atf_add_test_case "pr260867" }help
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