net/mlx5: fix exception handling

A sanity check is required in priv_fdir_disable(). If resizing Rx queue
fails, this can cause a crash by referencing a NULL pointer.

Fixes: 76f5c99e6840 ("mlx5: support flow director")
Fixes: 0cdddf4d0626 ("net/mlx5: split Rx queue structure")
Cc: stable@dpdk.org
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_fdir.c b/drivers/net/mlx5/mlx5_fdir.c
index f80c58b..1cff41b 100644 (file)
--- a/drivers/net/mlx5/mlx5_fdir.c
+++ b/drivers/net/mlx5/mlx5_fdir.c
@@ -733,9 +733,11 @@ priv_fdir_disable(struct priv *priv)
 
        /* Destroy flow director context in each RX queue. */
        for (i = 0; (i != priv->rxqs_n); i++) {
-               struct rxq_ctrl *rxq_ctrl =
-                       container_of((*priv->rxqs)[i], struct rxq_ctrl, rxq);
+               struct rxq_ctrl *rxq_ctrl;
 
+               if (!(*priv->rxqs)[i])
+                       continue;
+               rxq_ctrl = container_of((*priv->rxqs)[i], struct rxq_ctrl, rxq);
                if (!rxq_ctrl->fdir_queue)
                        continue;
                priv_fdir_queue_destroy(priv, rxq_ctrl->fdir_queue);