linux-kernel - Re: OOPS in nf_ct_unlink_expect_report using Polycom RealPresence Mobile

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 31 Jan 2014 17:04:02 +0100
From:	astx <astx@...-it.at>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, netfilter@...r.kernel.org
Subject: Re: OOPS in nf_ct_unlink_expect_report using Polycom RealPresence
 Mobile

Dear Alexey,

seems to help. Thank you for your quick response. Kernel 3.10.28 is  
now stable using h323 / Polycom.

Will test this patch with different kernel versions the next days.

Best Regards,
Toni


Original message from Alexey Dobriyan:
--------------------------------------------------------------------------------------
Date	Fri, 31 Jan 2014 16:29:58 +0300
Subject	Re: OOPS in nf_ct_unlink_expect_report using Polycom  
RealPresence Mobile
From	Alexey Dobriyan <>


> Disabling nf_nat_h323 and nf_conntrack_h323 avoids crash -
> but video conferencing software is no more usable.
>
> BUG: unable to handle kernel paging request at 00100104
> IP: [<f8214f07>] nf_ct_unlink_expect_report

This must be the same bug fixed in SIP module:
commit 3f509c689a07a4aa989b426893d8491a7ffcc410
netfilter: nf_nat_sip: fix incorrect handling of EBUSY for RTCP expectation

Try attached patch (if this is mangled):

--- 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;--- 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;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/