linux-kernel - [ 28/37] netfilter: xt_limit: have r->cost != 0 case work

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Date:	Thu, 18 Oct 2012 20:16:51 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Jan Engelhardt <jengelh@...i.de>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	David Miller <davem@...emloft.net>
Subject: [ 28/37] netfilter: xt_limit: have r->cost != 0 case work

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Engelhardt <jengelh@...i.de>

commit 82e6bfe2fbc4d48852114c4f979137cd5bf1d1a8 upstream.

Commit v2.6.19-rc1~1272^2~41 tells us that r->cost != 0 can happen when
a running state is saved to userspace and then reinstated from there.

Make sure that private xt_limit area is initialized with correct values.
Otherwise, random matchings due to use of uninitialized memory.

Signed-off-by: Jan Engelhardt <jengelh@...i.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Acked-by: David Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/xt_limit.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/netfilter/xt_limit.c
+++ b/net/netfilter/xt_limit.c
@@ -117,11 +117,11 @@ static int limit_mt_check(const struct x
 
 	/* For SMP, we only want to use one set of state. */
 	r->master = priv;
+	/* User avg in seconds * XT_LIMIT_SCALE: convert to jiffies *
+	   128. */
+	priv->prev = jiffies;
+	priv->credit = user2credits(r->avg * r->burst); /* Credits full. */
 	if (r->cost == 0) {
-		/* User avg in seconds * XT_LIMIT_SCALE: convert to jiffies *
-		   128. */
-		priv->prev = jiffies;
-		priv->credit = user2credits(r->avg * r->burst); /* Credits full. */
 		r->credit_cap = priv->credit; /* Credits full. */
 		r->cost = user2credits(r->avg);
 	}


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