[dpdk-stable] [PATCH] net/sfc: fix passing wrong buffer size

[Ivan Malov <ivan.malov@oktetlabs.ru>]

Pass the size of the buffer where the item's mask
is stored and not the indirection pointer size.

Coverity issue: 363735
Fixes: dadff137931c ("net/sfc: support encap flow items in transfer rules")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
---
 drivers/net/sfc/sfc_mae.c | 20 +++++++++-----------
 drivers/net/sfc/sfc_mae.h |  3 ++-
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/net/sfc/sfc_mae.c b/drivers/net/sfc/sfc_mae.c
index 7deccc9c60..7189a34140 100644
--- a/drivers/net/sfc/sfc_mae.c
+++ b/drivers/net/sfc/sfc_mae.c
@@ -1696,7 +1696,6 @@ sfc_mae_rule_parse_item_tunnel(const struct rte_flow_item *item,
 	uint8_t supp_mask[sizeof(uint64_t)];
 	const uint8_t *spec = NULL;
 	const uint8_t *mask = NULL;
-	const void *def_mask;
 	int rc;
 
 	/*
@@ -1718,12 +1717,11 @@ sfc_mae_rule_parse_item_tunnel(const struct rte_flow_item *item,
 	 * sfc_mae_rule_encap_parse_init(). Default mask
 	 * was also picked by that helper. Use it here.
 	 */
-	def_mask = ctx_mae->tunnel_def_mask;
-
 	rc = sfc_flow_parse_init(item,
 				 (const void **)&spec, (const void **)&mask,
-				 (const void *)&supp_mask, def_mask,
-				 sizeof(def_mask), error);
+				 (const void *)&supp_mask,
+				 ctx_mae->tunnel_def_mask,
+				 ctx_mae->tunnel_def_mask_size,  error);
 	if (rc != 0)
 		return rc;
 
@@ -1957,20 +1955,20 @@ sfc_mae_rule_encap_parse_init(struct sfc_adapter *sa,
 		case RTE_FLOW_ITEM_TYPE_VXLAN:
 			ctx->encap_type = EFX_TUNNEL_PROTOCOL_VXLAN;
 			ctx->tunnel_def_mask = &rte_flow_item_vxlan_mask;
-			RTE_BUILD_BUG_ON(sizeof(ctx->tunnel_def_mask) !=
-					 sizeof(rte_flow_item_vxlan_mask));
+			ctx->tunnel_def_mask_size =
+				sizeof(rte_flow_item_vxlan_mask);
 			break;
 		case RTE_FLOW_ITEM_TYPE_GENEVE:
 			ctx->encap_type = EFX_TUNNEL_PROTOCOL_GENEVE;
 			ctx->tunnel_def_mask = &rte_flow_item_geneve_mask;
-			RTE_BUILD_BUG_ON(sizeof(ctx->tunnel_def_mask) !=
-					 sizeof(rte_flow_item_geneve_mask));
+			ctx->tunnel_def_mask_size =
+				sizeof(rte_flow_item_geneve_mask);
 			break;
 		case RTE_FLOW_ITEM_TYPE_NVGRE:
 			ctx->encap_type = EFX_TUNNEL_PROTOCOL_NVGRE;
 			ctx->tunnel_def_mask = &rte_flow_item_nvgre_mask;
-			RTE_BUILD_BUG_ON(sizeof(ctx->tunnel_def_mask) !=
-					 sizeof(rte_flow_item_nvgre_mask));
+			ctx->tunnel_def_mask_size =
+				sizeof(rte_flow_item_nvgre_mask);
 			break;
 		case RTE_FLOW_ITEM_TYPE_END:
 			break;
diff --git a/drivers/net/sfc/sfc_mae.h b/drivers/net/sfc/sfc_mae.h
index 2822afce31..cbe4fd8e9f 100644
--- a/drivers/net/sfc/sfc_mae.h
+++ b/drivers/net/sfc/sfc_mae.h
@@ -274,7 +274,8 @@ struct sfc_mae_parse_ctx {
 	 * which part of the pattern is being parsed.
 	 */
 	const efx_mae_field_id_t	*field_ids_remap;
-	/* This points to a tunnel-specific default mask. */
+	/* These two fields correspond to the tunnel-specific default mask. */
+	size_t				tunnel_def_mask_size;
 	const void			*tunnel_def_mask;
 	bool				match_mport_set;
 	struct sfc_mae_pattern_data	pattern_data;
-- 
2.20.1