bnx2x: free the mac filter group list before freeing the cmd

The group list must be freed prior to freeing the command otherwise
we have a use-after-free.

Signed-off-by: Jason Baron <[email protected]>
Cc: Yuval Mintz <[email protected]>
Cc: Ariel Elior <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: almostivan

drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c

@@ -2714,8 +2714,8 @@ static int bnx2x_mcast_enqueue_cmd(struct bnx2x *bp,
 			elem_group = (struct bnx2x_mcast_elem_group *)
 				     __get_free_page(GFP_ATOMIC | __GFP_ZERO);
 			if (!elem_group) {
-				kfree(new_cmd);
 				bnx2x_free_groups(&new_cmd->group_head);
+				kfree(new_cmd);
 				return -ENOMEM;
 			}
 			total_elems -= MCAST_MAC_ELEMS_PER_PG;