[dpdk-dev] [PATCH v3 2/3] hash: fix total entries in free key with position

[Dharmik Thakkar <dharmik.thakkar@arm.com>]

In rte_hash, with current implementation, it is possible that keys
are stored at indexes greater than the number of total entries.

Currently, in rte_hash_free_key_with_position(), due to incorrect
computation of total_entries, application cannot free keys with
indexes greater than the number of total entries.

This patch fixes this incorrect computation of total_entries.

Bugzilla ID: 261
Fixes: 9d033dac7d7c ("hash: support no free on delete")
Cc: honnappa.nagarahalli@arm.com
Cc: stable@dpdk.org

Reported-by: Linfan <zhongdahulinfan@163.com>
Suggested-by: Linfan <zhongdahulinfan@163.com>
Signed-off-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
---
 lib/librte_hash/rte_cuckoo_hash.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 8646ca52e60b..ed2e96b6f178 100644
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -1594,7 +1594,9 @@ rte_hash_free_key_with_position(const struct rte_hash *h,
 
 	unsigned int lcore_id, n_slots;
 	struct lcore_cache *cached_free_slots;
-	const int32_t total_entries = h->num_buckets * RTE_HASH_BUCKET_ENTRIES;
+	const uint32_t total_entries = h->use_local_cache ?
+		h->entries + (RTE_MAX_LCORE - 1) * (LCORE_CACHE_SIZE - 1) + 1
+							: h->entries + 1;
 
 	/* Out of bounds */
 	if (key_idx >= total_entries)
-- 
2.17.1