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

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Date:	Mon, 22 Oct 2012 10:15:43 +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 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 :

diff --git a/net/core/dev.c b/net/core/dev.c
index 09cb3f6..a903cca 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2977,6 +2977,9 @@ int netif_rx(struct sk_buff *skb)
 {
 	int ret;
 
+#ifdef CONFIG_XFRM
+	WARN_ON_ONCE(skb->sp);
+#endif
 	/* if netpoll wants it, pretend we never saw it */
 	if (netpoll_rx(skb))
 		return NET_RX_DROP;
@@ -3388,6 +3391,9 @@ out:
  */
 int netif_receive_skb(struct sk_buff *skb)
 {
+#ifdef CONFIG_XFRM
+	WARN_ON_ONCE(skb->sp);
+#endif
 	net_timestamp_check(netdev_tstamp_prequeue, skb);
 
 	if (skb_defer_rx_timestamp(skb))
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index ab2bb42..5930e91 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -29,11 +29,10 @@ struct sec_path *secpath_dup(struct sec_path *src)
 {
 	struct sec_path *sp;
 
-	sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
+	sp = kmem_cache_zalloc(secpath_cachep, GFP_ATOMIC);
 	if (!sp)
 		return NULL;
 
-	sp->len = 0;
 	if (src) {
 		int i;
 


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