[Bug 54] New: Kernel crash with pptp connectiontrack

bugzilla-daemon@netfilter.org bugzilla-daemon@netfilter.org
Mon, 24 Feb 2003 15:46:12 +0100


           Summary: Kernel crash with pptp connectiontrack
           Product: netfilter/iptables
           Version: linux-2.4.x
          Platform: i386
        OS/Version: Gentoo
            Status: NEW
          Severity: major
          Priority: P2
         Component: connection tracking
        AssignedTo: laforge@netfilter.org
        ReportedBy: mg@connection-net.de
                CC: netfilter-buglog@lists.netfilter.org

The setup is basicly like this:

Workstation  --->  Linux Router ---> .... ---> PPTP Server
(local adress)     (NAT)               (Public adress, t-online)

The Linux router has NAT configured for the Workstation
(iptables -t nat -A POSTROUTING  -s -j MASQUERADE)

When the workstation does try to connect to the PPTP Server everything goes
fine, but when the workstation does terminate the connection the linux Router
OOPS with a NULL pointer reference and halts.

I'm using 2.4.20 with gentoo patches (where PPTP NAT is included), the version
is  * ip_conntrack_pptp.c  - Version 1.2

I did test various combinations (i.e. without pptp patch it does not work, but
does not crash, with the pptp patch it works, but crashes)

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