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[3.x] Core: Add recursion level check for VariantWriter::write() #81114

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merged 1 commit into from
Sep 6, 2023
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[3.x] Core: Add recursion level check for VariantWriter::write() #81114

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32 changes: 27 additions & 5 deletions core/variant_parser.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1588,7 +1588,7 @@ static String rtos_fix(double p_value) {
}
}

Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud, EncodeResourceFunc p_encode_res_func, void *p_encode_res_ud) {
Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud, EncodeResourceFunc p_encode_res_func, void *p_encode_res_ud, int p_recursion_count) {
switch (p_variant.get_type()) {
case Variant::NIL: {
p_store_string_func(p_store_string_ud, "null");
Expand Down Expand Up @@ -1705,6 +1705,13 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
} break;

case Variant::OBJECT: {
if (unlikely(p_recursion_count > MAX_RECURSION)) {
ERR_PRINT("Max recursion reached");
p_store_string_func(p_store_string_ud, "null");
return OK;
}
p_recursion_count++;

Object *obj = p_variant;

if (!obj) {
Expand Down Expand Up @@ -1754,7 +1761,7 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
}

p_store_string_func(p_store_string_ud, "\"" + E->get().name + "\":");
write(obj->get(E->get().name), p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud);
write(obj->get(E->get().name), p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud, p_recursion_count);
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}
}

Expand All @@ -1763,6 +1770,13 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
} break;

case Variant::DICTIONARY: {
if (unlikely(p_recursion_count > MAX_RECURSION)) {
ERR_PRINT("Max recursion reached");
p_store_string_func(p_store_string_ud, "{}");
return OK;
}
p_recursion_count++;

Dictionary dict = p_variant;

List<Variant> keys;
Expand All @@ -1775,9 +1789,9 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
if (!_check_type(dict[E->get()]))
continue;
*/
write(E->get(), p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud);
write(E->get(), p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud, p_recursion_count);
p_store_string_func(p_store_string_ud, ": ");
write(dict[E->get()], p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud);
write(dict[E->get()], p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud, p_recursion_count);
if (E->next()) {
p_store_string_func(p_store_string_ud, ",\n");
} else {
Expand All @@ -1789,14 +1803,21 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str

} break;
case Variant::ARRAY: {
if (unlikely(p_recursion_count > MAX_RECURSION)) {
ERR_PRINT("Max recursion reached");
p_store_string_func(p_store_string_ud, "[]");
return OK;
}
p_recursion_count++;

p_store_string_func(p_store_string_ud, "[ ");
Array array = p_variant;
int len = array.size();
for (int i = 0; i < len; i++) {
if (i > 0) {
p_store_string_func(p_store_string_ud, ", ");
}
write(array[i], p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud);
write(array[i], p_store_string_func, p_store_string_ud, p_encode_res_func, p_encode_res_ud, p_recursion_count);
}
p_store_string_func(p_store_string_ud, " ]");

Expand Down Expand Up @@ -1927,6 +1948,7 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
p_store_string_func(p_store_string_ud, " )");

} break;

default: {
}
}
Expand Down
2 changes: 1 addition & 1 deletion core/variant_parser.h
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Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,7 @@ class VariantWriter {
typedef Error (*StoreStringFunc)(void *ud, const String &p_string);
typedef String (*EncodeResourceFunc)(void *ud, const RES &p_resource);

static Error write(const Variant &p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud, EncodeResourceFunc p_encode_res_func, void *p_encode_res_ud);
static Error write(const Variant &p_variant, StoreStringFunc p_store_string_func, void *p_store_string_ud, EncodeResourceFunc p_encode_res_func, void *p_encode_res_ud, int p_recursion_count = 0);
static Error write_to_string(const Variant &p_variant, String &r_string, EncodeResourceFunc p_encode_res_func = nullptr, void *p_encode_res_ud = nullptr);
};

Expand Down