netdev - Re: PROBLEM: Memory leak (at least with SLUB) from "secpath

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Message-ID: <1350918997.8609.858.camel@edumazet-glaptop>
Date:	Mon, 22 Oct 2012 17:16:37 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mike Kazantsev <mk.fraggod@...il.com>
Cc:	Paul Moore <paul@...l-moore.com>, netdev@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: PROBLEM: Memory leak (at least with SLUB) from "secpath_dup"
 (xfrm) in 3.5+ kernels

On Mon, 2012-10-22 at 18:06 +0600, Mike Kazantsev wrote:
> On Mon, 22 Oct 2012 10:15:43 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > On Mon, 2012-10-22 at 04:58 +0600, Mike Kazantsev wrote:
> > 
> > > I've grepped for "/org/free" specifically and sure enough, same scraps
> > > of data seem to be in some of the (varied) dumps there.
> > 
> > Content is not meaningful, as we dont initialize it.
> > So you see previous content.
> > 
> > Could you try the following :
> > 
> ...
> 
> With this patch on top of v3.7-rc2 (w/o patches from your previous
> mail), leak seem to be still present.

OK, I believe I found the bug in IPv4 defrag / IPv6 reasm

Please test the following patch.

Thanks !

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 448e685..0a52771 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -48,6 +48,7 @@
 #include <linux/inet.h>
 #include <linux/netfilter_ipv4.h>
 #include <net/inet_ecn.h>
+#include <net/xfrm.h>
 
 /* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6
  * code now. If you change something here, _PLEASE_ update ipv6/reassembly.c
@@ -634,6 +635,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		else if (head->ip_summed == CHECKSUM_COMPLETE)
 			head->csum = csum_add(head->csum, fp->csum);
 
+		secpath_reset(fp);
 		if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
 			kfree_skb_partial(fp, headstolen);
 		} else {
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index da8a4e3..4fcc463 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -55,6 +55,7 @@
 #include <net/ndisc.h>
 #include <net/addrconf.h>
 #include <net/inet_frag.h>
+#include <net/xfrm.h>
 
 struct ip6frag_skb_cb
 {
@@ -456,6 +457,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
 		else if (head->ip_summed == CHECKSUM_COMPLETE)
 			head->csum = csum_add(head->csum, fp->csum);
 
+		secpath_reset(fp);
 		if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
 			kfree_skb_partial(fp, headstolen);
 		} else {


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