net/mlx5e: TC, Add null pointer check for hardware miss support

The cited commits add hardware miss support to tc action. But if
the rules can't be offloaded, the pointers are null and system
will panic when accessing them.

Fix it by checking null pointer.

Fixes: 08fe94ec5f77 ("net/mlx5e: TC, Remove special handling of CT action")
Fixes: 6702782845a5 ("net/mlx5e: TC, Set CT miss to the specific ct action instance")
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Paul Blakey <paulb@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
index ead38ef6948313dd96366ac70c1d2d1f0c7cf0c3..a254e728ac95442cbbccde0d02e6616a11b97d72 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c
@@ -2021,6 +2021,8 @@ void
 mlx5_tc_ct_delete_flow(struct mlx5_tc_ct_priv *priv,
                       struct mlx5_flow_attr *attr)
 {
+       if (!attr->ct_attr.ft) /* no ct action, return */
+               return;
        if (!attr->ct_attr.nf_ft) /* means only ct clear action, and not ct_clear,ct() */
                return;