[dpdk-dev] [PATCH v2] net/ice: fix hash flow segmentation fault

[taox.zhu@intel.com]

From: Zhu Tao <taox.zhu@intel.com>

Macro rte_errno is not a static value, so it needs to be updated in all
error handling code.

Patch 'dc36bd5dfdeb' mistakenly consider that rte_errno is a constant, which
causes the unrecognized flow rule to be marked as recognition success.
Later, when the code tried to parse the flow rule, a null pointer caused
a segmentation fault.

Fixes: dc36bd5dfdeb ("net/ice: fix flow FDIR/switch memory leak")
Cc: stable@dpdk.org

Signed-off-by: Zhu Tao <taox.zhu@intel.com>
---
v2 Changes:

 Commit message: Use 12 chars length of commit SHA in Fixes line.

 drivers/net/ice/ice_hash.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ice/ice_hash.c b/drivers/net/ice/ice_hash.c
index d891538bd..e5fb0f344 100644
--- a/drivers/net/ice/ice_hash.c
+++ b/drivers/net/ice/ice_hash.c
@@ -409,7 +409,7 @@ ice_hash_parse_pattern_action(__rte_unused struct ice_adapter *ad,
 			void **meta,
 			struct rte_flow_error *error)
 {
-	int ret = -rte_errno;
+	int ret = 0;
 	struct ice_pattern_match_item *pattern_match_item;
 	struct rss_meta *rss_meta_ptr;
 
@@ -424,12 +424,16 @@ ice_hash_parse_pattern_action(__rte_unused struct ice_adapter *ad,
 	/* Check rss supported pattern and find matched pattern. */
 	pattern_match_item = ice_search_pattern_match_item(pattern,
 					array, array_len, error);
-	if (!pattern_match_item)
+	if (!pattern_match_item) {
+		ret = -rte_errno;
 		goto error;
+	}
 
 	ret = ice_hash_check_inset(pattern, error);
-	if (ret)
+	if (ret) {
+		ret = -rte_errno;
 		goto error;
+	}
 
 	/* Save protocol header to rss_meta. */
 	*meta = rss_meta_ptr;
@@ -439,8 +443,10 @@ ice_hash_parse_pattern_action(__rte_unused struct ice_adapter *ad,
 	/* Check rss action. */
 	ret = ice_hash_parse_action(pattern_match_item, actions, meta, error);
 error:
-	if (ret)
+	if (ret) {
+		ret = -rte_errno;
 		rte_free(rss_meta_ptr);
+	}
 	rte_free(pattern_match_item);
 
 	return ret;
-- 
2.17.1