[13/45] sit: fix off-by-one in ipip6_tunnel_get_prl

[Greg KH]

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

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

From: Sascha Hlusiak <contact@xxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxx>
Acked-By: Fred L. Templin <Fred.L.Templin@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 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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