[dpdk-dev] [PATCH] net/mlx5: fix GRE key handle before GRE header issue

[Suanming Mou <suanmingm@mellanox.com>]

When set the GRE item, GRE key should follow after GRE header, or the
header gre_item pointer used by the key will be invalid.

Currently in the mlx5_flow_validate_item_gre_key() function, the header
gre_item pointer is access before checking if the key is after the header
or not. Once the key item is before the header, invalid gre_item pointer
access happens.

Move the gre_item pointer access after the GRE header check to avoid the
crash issue.

Fixes: a7a0365565a4 ("net/mlx5: match GRE key and present bits")
Cc: jackmin@mellanox.com

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Ori Kam <orika@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 65a0e65..5c78ea7 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1998,8 +1998,8 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 	const rte_be32_t *mask = item->mask;
 	int ret = 0;
 	rte_be32_t gre_key_default_mask = RTE_BE32(UINT32_MAX);
-	const struct rte_flow_item_gre *gre_spec = gre_item->spec;
-	const struct rte_flow_item_gre *gre_mask = gre_item->mask;
+	const struct rte_flow_item_gre *gre_spec;
+	const struct rte_flow_item_gre *gre_mask;
 
 	if (item_flags & MLX5_FLOW_LAYER_GRE_KEY)
 		return rte_flow_error_set(error, ENOTSUP,
@@ -2013,8 +2013,10 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		return rte_flow_error_set(error, ENOTSUP,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "GRE key following a wrong item");
+	gre_mask = gre_item->mask;
 	if (!gre_mask)
 		gre_mask = &rte_flow_item_gre_mask;
+	gre_spec = gre_item->spec;
 	if (gre_spec && (gre_mask->c_rsvd0_ver & RTE_BE16(0x2000)) &&
 			 !(gre_spec->c_rsvd0_ver & RTE_BE16(0x2000)))
 		return rte_flow_error_set(error, EINVAL,
-- 
1.8.3.1