Re: OOPS NULL pointer dereference in nf_nat_setup_info+0x471 (reproductible, 3.14.4)

[Vincent Tondellier <tondellier+ml.nfdev@dosisoft.fr>]

Hi, 

Florian Westphal wrote :
> Vincent Tondellier <tondellier+ml.nfdev@dosisoft.fr> wrote:
> > sysctl -w net.ipv4.ip_forward=1
> > sysctl -w net.netfilter.nf_conntrack_helper=0
> > sysctl -w net.netfilter.nf_conntrack_acct=1
> > 
> > And try to connect the pptp client. Instant oops.
> 
> Q: does it not oops with _acct=0?

No oops when _acct == 0, and I can't reproduce it with the ftp helper, or 
without the iptables helpers (_helper=0 is not needed, only the iptables 
rules)

> If that fixes it, and you have lockdep enabled in kernel
> config 

# grep LOCKDEP /boot/config-3.14.4
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_LOCKDEP=y
CONFIG_DEBUG_LOCKDEP=y

> -- can you check if
> 
> commit 223b02d923ecd7c84cf9780bb3686f455d279279
> netfilter: nf_conntrack: reserve two bytes for nf_ct_ext->len
> 
> helps?

yes, no oops. Seems to be scheduled for 3.14.5

and 3.15-rc7 works too

I will ask the debian bug [1] reporter if it fixes his problem

Thanks


[1] https://bugs.debian.org/741667