1 files changed, 28 insertions, 0 deletions
diff --git a/contrib/libcbor/test/stack_over_limit_test.c b/contrib/libcbor/test/stack_over_limit_test.c
new file mode 100644
index 000000000000..73b6bdc2567b
--- /dev/null
+++ b/contrib/libcbor/test/stack_over_limit_test.c
@@ -0,0 +1,28 @@
+#include "assertions.h"
+#include "cbor.h"
+
+static size_t generate_overflow_data(unsigned char **overflow_data) {
+  int i;
+  *overflow_data = (unsigned char *)malloc(CBOR_MAX_STACK_SIZE + 3);
+  for (i = 0; i < CBOR_MAX_STACK_SIZE + 1; i++) {
+    (*overflow_data)[i] = 0xC2;  // tag of positive bignum
+  }
+  (*overflow_data)[CBOR_MAX_STACK_SIZE + 1] = 0x41;  // bytestring of length 1
+  (*overflow_data)[CBOR_MAX_STACK_SIZE + 2] = 0x01;  // a bignum of value 1
+  return CBOR_MAX_STACK_SIZE + 3;
+}
+
+static void test_stack_over_limit(void **_CBOR_UNUSED(_state)) {
+  unsigned char *overflow_data;
+  size_t overflow_data_len;
+  struct cbor_load_result res;
+  overflow_data_len = generate_overflow_data(&overflow_data);
+  assert_null(cbor_load(overflow_data, overflow_data_len, &res));
+  free(overflow_data);
+  assert_size_equal(res.error.code, CBOR_ERR_MEMERROR);
+}
+
+int main(void) {
+  const struct CMUnitTest tests[] = {cmocka_unit_test(test_stack_over_limit)};
+  return cmocka_run_group_tests(tests, NULL, NULL);
+}