From 8ee8ab30999b7850b7db0d74b9e05211a6949c38 Mon Sep 17 00:00:00 2001
From: Wenyong Huang <wenyong.huang@intel.com>
Date: Tue, 28 Mar 2023 14:50:31 +0800
Subject: [PATCH] Limit the minimal size of bh_hashmap (#2073)

Limit the minimal size of bh_hashmap to avoid creating hashmap with size 0,
and `divide by zero` when calling bh_hash_map_find.

Reported by #2008.
---
 core/shared/utils/bh_hashmap.c | 3 +++
 core/shared/utils/bh_hashmap.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/core/shared/utils/bh_hashmap.c b/core/shared/utils/bh_hashmap.c
index 70119c77..3502239a 100644
--- a/core/shared/utils/bh_hashmap.c
+++ b/core/shared/utils/bh_hashmap.c
@@ -33,6 +33,9 @@ bh_hash_map_create(uint32 size, bool use_lock, HashFunc hash_func,
     HashMap *map;
     uint64 total_size;
 
+    if (size < HASH_MAP_MIN_SIZE)
+        size = HASH_MAP_MIN_SIZE;
+
     if (size > HASH_MAP_MAX_SIZE) {
         LOG_ERROR("HashMap create failed: size is too large.\n");
         return NULL;
diff --git a/core/shared/utils/bh_hashmap.h b/core/shared/utils/bh_hashmap.h
index ef06960f..38aa2c66 100644
--- a/core/shared/utils/bh_hashmap.h
+++ b/core/shared/utils/bh_hashmap.h
@@ -12,6 +12,9 @@
 extern "C" {
 #endif
 
+/* Minimum initial size of hash map */
+#define HASH_MAP_MIN_SIZE 4
+
 /* Maximum initial size of hash map */
 #define HASH_MAP_MAX_SIZE 65536