core: memory exhaustion bug fix (#45)

Signed-off-by: Leonardo Alminana <[email protected]>

Author: leonardo-albertovich

include/ctraces/ctr_variant_utils.h

@@ -22,6 +22,10 @@
 
 #include <mpack/mpack.h>
 
+#define CFL_VARIANT_UTILS_MAXIMUM_FIXED_ARRAY_SIZE    100
+#define CFL_VARIANT_UTILS_INITIAL_ARRAY_SIZE          100
+#define CFL_VARIANT_UTILS_SERIALIZED_ARRAY_SIZE_LIMIT 100000
+
 /* These are the only functions meant for general use,
  * the reason why the kvlist packing and unpacking
  * functions are exposed is the internal and external
@@ -226,12 +230,25 @@ static inline int unpack_cfl_array(mpack_reader_t *reader,
 
     entry_count = mpack_tag_array_count(&tag);
 
-    internal_array = cfl_array_create(entry_count);
+    if (entry_count >= CFL_VARIANT_UTILS_SERIALIZED_ARRAY_SIZE_LIMIT) {
+        return -2;
+    }
+
+    if (entry_count >= CFL_VARIANT_UTILS_MAXIMUM_FIXED_ARRAY_SIZE) {
+        internal_array = cfl_array_create(CFL_VARIANT_UTILS_INITIAL_ARRAY_SIZE);
+    }
+    else {
+        internal_array = cfl_array_create(entry_count);
+    }
 
     if (internal_array == NULL) {
         return -3;
     }
 
+    if (entry_count >= CFL_VARIANT_UTILS_MAXIMUM_FIXED_ARRAY_SIZE) {
+        cfl_array_resizable(internal_array, CFL_TRUE);
+    }
+
     for (index = 0 ; index < entry_count ; index++) {
         result = unpack_cfl_variant(reader, &entry_value);