linux-kernel - Re: [slab poison overwritten] Re: [GIT] Networking

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Message-ID: <1300738540.2837.5.camel@edumazet-laptop>
Date:	Mon, 21 Mar 2011 21:15:40 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Miller <davem@...emloft.net>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Simon Horman <horms@...ge.net.au>, Julian Anastasov <ja@....bg>
Subject: Re: [slab poison overwritten] Re: [GIT] Networking

Le lundi 21 mars 2011 à 19:07 +0100, Eric Dumazet a écrit :
> Le lundi 21 mars 2011 à 18:39 +0100, Ingo Molnar a écrit :
> > here's the same but with kallsyms enabled.
> > 
> > Thanks,
> > 
> > 	Ingo
> > 
> > [    9.585627] initcall 0xffffffff81d5b806 returned 0 after 0 usecs
> > [    9.588960] calling  0xffffffff81d5b9da @ 1
> > [    9.592303] IPVS: Creating netns size=1272 id=0
> > [    9.595646] IPVS: __ip_vs_control_init(): alloc_percpu.
> > [    9.602298] IPVS: cannot register namespace.
> > [    9.605627] IPVS: can't setup control
> 
> It seems IPVS is busted in case of memory allocation error in 
> __ip_vs_control_init()
> 
> IPVS deinits its "struct netns_ipvs" space, but something (in IPVS) uses
> it after free.
> 
> __ip_vs_init() seems to be called before ip_vs_init() completes
> correctly. We then keep in net->ipvs a pointer to some freed memory.
> 
> Commit 14e405461e664b7 did some changes in this area
> 
> Simon, any idea ?
> 
> 

For the time being, we can avoid the false memory allocation error (and
leak)

Thanks

[PATCH] ipvs: fix a typo in __ip_vs_control_init()

Reported-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Simon Horman <horms@...ge.net.au>
Cc: Julian Anastasov <ja@....bg>
---
 net/netfilter/ipvs/ip_vs_ctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index b799cea..33733c8 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -3605,7 +3605,7 @@ int __net_init __ip_vs_control_init(struct net *net)
 
 	/* procfs stats */
 	ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
-	if (ipvs->tot_stats.cpustats) {
+	if (!ipvs->tot_stats.cpustats) {
 		pr_err("%s(): alloc_percpu.\n", __func__);
 		return -ENOMEM;
 	}


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