[PATCH 1/1] net/sfc: add explicit fail path for unknown tunnel flow type

[Ivan Malov]

The driver supports flow tunnel offload. When the parsed rule
type is unknown, which must not happen, the driver does not
properly indicate the failure in non-debug builds. That
presumably makes Coverity report possible NULL pointer
dereference in regard with uninitialised HW match
specification (which gets properly initialised
when the rule type check is successful).

In order to fix this, replace the debug
assert with a proper runtime fail path.

Coverity issue: 393675
Fixes: 73e01736868b ("net/sfc: turn MAE flow action rules into shareable resources")
Cc: stable at dpdk.org

Signed-off-by: Ivan Malov <ivan.malov at arknetworks.am>
---
 drivers/net/sfc/sfc_mae.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/sfc/sfc_mae.c b/drivers/net/sfc/sfc_mae.c
index 60a54fd425..f5fe55b46f 100644
--- a/drivers/net/sfc/sfc_mae.c
+++ b/drivers/net/sfc/sfc_mae.c
@@ -3460,8 +3460,10 @@ sfc_mae_rule_parse_pattern(struct sfc_adapter *sa,
 		}
 		break;
 	default:
-		SFC_ASSERT(B_FALSE);
-		break;
+		rc = rte_flow_error_set(error, EINVAL,
+			RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
+			"FT: unexpected rule type");
+		goto fail_unexpected_ft_rule_type;
 	}
 
 	/*
@@ -3531,6 +3533,7 @@ sfc_mae_rule_parse_pattern(struct sfc_adapter *sa,
 	if (ctx_mae.match_spec_action != NULL)
 		efx_mae_match_spec_fini(sa->nic, ctx_mae.match_spec_action);
 
+fail_unexpected_ft_rule_type:
 fail_init_match_spec_action:
 fail_priority_check:
 	return rc;
-- 
2.17.1