[PATCH v2 4/5] net/qede: fix use after free

[Stephen Hemminger <stephen@networkplumber.org>]

The loop cleaning up flowdir resources was using SLIST_FOREACH
but the inner loop would call rte_free. Found by building with
address sanitizer undefined check.

Also remove needless initialization, and null check.

Fixes: f5765f66f9bb ("net/qede: refactor flow director into generic aRFS")
Cc: shahed.shaikh@cavium.com
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/qede/qede_filter.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/qede/qede_filter.c b/drivers/net/qede/qede_filter.c
index 14fb4338e9..5db36b03e2 100644
--- a/drivers/net/qede/qede_filter.c
+++ b/drivers/net/qede/qede_filter.c
@@ -10,6 +10,13 @@
 #include <rte_errno.h>
 #include <rte_flow_driver.h>
 
+#ifndef SLIST_FOREACH_SAFE
+#define	SLIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+#endif
+
 #include "qede_ethdev.h"
 
 /* VXLAN tunnel classification mapping */
@@ -154,15 +161,12 @@ int qede_check_fdir_support(struct rte_eth_dev *eth_dev)
 void qede_fdir_dealloc_resc(struct rte_eth_dev *eth_dev)
 {
 	struct qede_dev *qdev = QEDE_INIT_QDEV(eth_dev);
-	struct qede_arfs_entry *tmp = NULL;
+	struct qede_arfs_entry *tmp, *tmp2;
 
-	SLIST_FOREACH(tmp, &qdev->arfs_info.arfs_list_head, list) {
-		if (tmp) {
-			rte_memzone_free(tmp->mz);
-			SLIST_REMOVE(&qdev->arfs_info.arfs_list_head, tmp,
-				     qede_arfs_entry, list);
-			rte_free(tmp);
-		}
+	SLIST_FOREACH_SAFE(tmp, &qdev->arfs_info.arfs_list_head, list, tmp2) {
+		rte_memzone_free(tmp->mz);
+		SLIST_REMOVE(&qdev->arfs_info.arfs_list_head, tmp, qede_arfs_entry, list);
+		rte_free(tmp);
 	}
 }
 
-- 
2.45.2