net/mlx5e: Fix usage of rcu-protected pointer

In mlx5e_configure_flower() flow pointer is protected by rcu read lock.
However, after cited commit the pointer is being used outside of rcu read
block. Extend the block to protect all pointer accesses.

Fixes: 553f932 ("net/mlx5e: Support tc block sharing for representors")
Signed-off-by: Vlad Buslov <[email protected]>
Reviewed-by: Roi Dayan <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: w1ldptr

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -4687,22 +4687,25 @@ int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
 
 	rcu_read_lock();
 	flow = rhashtable_lookup(tc_ht, &f->cookie, tc_ht_params);
-	rcu_read_unlock();
 	if (flow) {
 		/* Same flow rule offloaded to non-uplink representor sharing tc block,
 		 * just return 0.
 		 */
 		if (is_flow_rule_duplicate_allowed(dev, rpriv) && flow->orig_dev != dev)
-			goto out;
+			goto rcu_unlock;
 
 		NL_SET_ERR_MSG_MOD(extack,
 				   "flow cookie already exists, ignoring");
 		netdev_warn_once(priv->netdev,
 				 "flow cookie %lx already exists, ignoring\n",
 				 f->cookie);
 		err = -EEXIST;
-		goto out;
+		goto rcu_unlock;
 	}
+rcu_unlock:
+	rcu_read_unlock();
+	if (flow)
+		goto out;
 
 	trace_mlx5e_configure_flower(f);
 	err = mlx5e_tc_add_flow(priv, f, flags, dev, &flow);