From 829d9315c46a2be57a8fb40c89aeb7db61513d96 Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Mon, 3 Feb 2014 13:07:24 +0100 Subject: [PATCH] netfilter: nf_nat_h323: fix crash in nf_ct_unlink_expect_report() Similar bug fixed in SIP module in 3f509c6 ("netfilter: nf_nat_sip: fix incorrect handling of EBUSY for RTCP expectation"). BUG: unable to handle kernel paging request at 00100104 IP: [] nf_ct_unlink_expect_report+0x57/0xf0 [nf_conntrack] ... Call Trace: [] ? del_timer+0x48/0x70 [] nf_ct_remove_expectations+0x47/0x60 [nf_conntrack] [] nf_ct_delete_from_lists+0x59/0x90 [nf_conntrack] [] death_by_timeout+0x14e/0x1c0 [nf_conntrack] [] ? nf_conntrack_set_hashsize+0x190/0x190 [nf_conntrack] [] call_timer_fn+0x1d/0x80 [] run_timer_softirq+0x18e/0x1a0 [] ? nf_conntrack_set_hashsize+0x190/0x190 [nf_conntrack] [] __do_softirq+0xa3/0x170 [] ? __local_bh_enable+0x70/0x70 [] ? irq_exit+0x67/0xa0 [] ? do_IRQ+0x46/0xb0 [] ? clockevents_notify+0x35/0x110 [] ? common_interrupt+0x2c/0x40 [] ? cpuidle_enter_state+0x41/0xf0 [] ? cpuidle_idle_call+0x8b/0x100 [] ? arch_cpu_idle+0x8/0x30 [] ? cpu_idle_loop+0x4b/0x140 [] ? cpu_startup_entry+0x18/0x20 [] ? rest_init+0x5d/0x70 [] ? start_kernel+0x2ec/0x2f2 [] ? repair_env_string+0x5b/0x5b [] ? i386_start_kernel+0x33/0x35 Signed-off-by: Alexey Dobriyan Signed-off-by: Pablo Neira Ayuso --- net/ipv4/netfilter/nf_nat_h323.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c index 9eea059dd621..574f7ebba0b6 100644 --- a/net/ipv4/netfilter/nf_nat_h323.c +++ b/net/ipv4/netfilter/nf_nat_h323.c @@ -229,7 +229,10 @@ static int nat_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, ret = nf_ct_expect_related(rtcp_exp); if (ret == 0) break; - else if (ret != -EBUSY) { + else if (ret == -EBUSY) { + nf_ct_unexpect_related(rtp_exp); + continue; + } else if (ret < 0) { nf_ct_unexpect_related(rtp_exp); nated_port = 0; break; -- 2.30.2