sit: fix off-by-one in ipip6_tunnel_get_prl

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@saschahlusiak.de>
Acked-By: Fred L. Templin <Fred.L.Templin@boeing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index d65e0c496cc0..dbd19a78ca73 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -274,7 +274,7 @@ static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
 
         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;