linux-kernel - Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <48889E57.2000007@trash.net>
Date:	Thu, 24 Jul 2008 17:23:03 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au,
	w@....eu, davidn@...idnewall.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stefanr@...6.in-berlin.de,
	rjw@...k.pl, ilpo.jarvinen@...sinki.fi,
	Dave Jones <davej@...hat.com>,
	Krzysztof Piotr Oledzki <ole@....pl>
Subject: Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL
 pointer dereference

Ingo Molnar wrote:
> Then i tried both suggested fix patches Patrick sent me (a suggested 
> revert and an netfilter/RCU use-after-free fix), but none of them solved 
> the crash.

Just to make sure - the "netfilter/RCU use-after-free fix" was the
patch from Pekka?

> Thus i finally arrived to:
> 
>  # good: [ae6134bd] hdlcdrv: Fix CRC calculation.
>  # bad:  [5547cd0d] netfilter: nf_conntrack_sctp: fix sparse warnings
>  # bad:  [280763c6] netfilter: xt_time: fix time's time_mt()'s use of
>  # good: [07a7c10b] netlink: add NLA_PUT_BE64 macro
>  # bad:  [58401573] netfilter: accounting rework: ct_extend + 64bit co
> 
> | 584015727a3b88b46602b20077b46cd04f8b4ab3 is first bad commit
> | commit 584015727a3b88b46602b20077b46cd04f8b4ab3
> | Author: Krzysztof Piotr Oledzki <ole@....pl>
> | AuthorDate: Mon Jul 21 10:01:34 2008 -0700
> | Commit:     David S. Miller <davem@...emloft.net>
> | CommitDate: Mon Jul 21 10:10:58 2008 -0700
> |
> |    netfilter: accounting rework: ct_extend + 64bit counters (v4)
> [...]
> |     Signed-off-by: Krzysztof Piotr Oledzki <ole@....pl>
> |     Signed-off-by: Patrick McHardy <kaber@...sh.net>
> |     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> Which i double-checked by reverting that commit from -git as well and 
> that solved the crash. Find the tested reverter patch below.

Thats odd. I don't think anything is wrong with that patch
itself, its more likely that its triggering a bug in
ct_extend. You config has a few helper enabled (FTP, H.323,
TFTP) and the crash is when trying to call the helper functions.
Did you actually have traffic of one of these protocols?

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