[dpdk-stable] [PATCH v3] net/ice: fix hash flow segmentation fault

[taox.zhu at intel.com]

From: Zhu Tao <taox.zhu at 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 at dpdk.org

Signed-off-by: Zhu Tao <taox.zhu at intel.com>
---
v3 Changes:

 Commit message: Use 12 chars length of commit SHA in Fixes line.
 Code: Delete redundant assignment codes.

v2 Changes:

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

 drivers/net/ice/ice_hash.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ice/ice_hash.c b/drivers/net/ice/ice_hash.c
index d891538bd..0e9c3c4e5 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;
 
@@ -424,8 +424,10 @@ 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)
-- 
2.17.1