net: mvpp2: cls: Check RSS table index validity when creating a context

Make sure we don't use an out-of-bound index for the per-port RSS
context array.

As of today, the global context creation in mvpp22_rss_context_create
will prevent us from reaching this case, but we should still make sure
we are using a sane value anyway.

Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index cd0daad..bd19a91 100644 (file)
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -1466,6 +1466,9 @@ int mvpp22_port_rss_ctx_create(struct mvpp2_port *port, u32 *port_ctx)
                        break;
        }
 
+       if (i == MVPP22_N_RSS_TABLES)
+               return -EINVAL;
+
        port->rss_ctx[i] = rss_ctx;
        *port_ctx = i;