linux-kernel - [13/45] sit: fix off-by-one in ipip6_tunnel_get

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Message-Id: <20100330224947.310212430@linux.site>
Date:	Tue, 30 Mar 2010 15:48:33 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sascha Hlusiak <contact@...chahlusiak.de>,
	"Fred L. Templin" <Fred.L.Templin@...ing.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [13/45] sit: fix off-by-one in ipip6_tunnel_get_prl

2.6.27-stable review patch.  If anyone has any objections, please let us know.

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

From: Sascha Hlusiak <contact@...chahlusiak.de>

commit 298bf12ddb25841804f26234a43b89da1b1c0e21 upstream.

When requesting all prl entries (kprl.addr == INADDR_ANY) and there are
more prl entries than there is space passed from userspace, the existing
code would always copy cmax+1 entries, which is more than can be handled.

This patch makes the kernel copy only exactly cmax entries.

Signed-off-by: Sascha Hlusiak <contact@...chahlusiak.de>
Acked-By: Fred L. Templin <Fred.L.Templin@...ing.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/ipv6/sit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -260,7 +260,7 @@ static int ipip6_tunnel_get_prl(struct i

 	c = 0;
 	for (prl = t->prl; prl; prl = prl->next) {
-		if (c > cmax)
+		if (c >= cmax)
 			break;
 		if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
 			continue;

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