Fix: add depth check to prevent stack overflow in cJSON_Print (#984)

Author: liloler

cJSON.c

@@ -1598,6 +1598,11 @@ static cJSON_bool print_array(const cJSON * const item, printbuffer * const outp
         return false;
     }
 
+    if (output_buffer->depth >= CJSON_NESTING_LIMIT)
+    {
+        return false; /* nesting is too deep */
+    }
+
     /* Compose the output array. */
     /* opening square bracket */
     output_pointer = ensure(output_buffer, 1);
@@ -1778,6 +1783,11 @@ static cJSON_bool print_object(const cJSON * const item, printbuffer * const out
         return false;
     }
 
+    if (output_buffer->depth >= CJSON_NESTING_LIMIT)
+    {
+        return false; /* nesting is too deep */
+    }
+
     /* Compose the output: */
     length = (size_t) (output_buffer->format ? 2 : 1); /* fmt: {\n */
     output_pointer = ensure(output_buffer, length + 1);