1 files changed, 68 insertions, 0 deletions
diff --git a/dtc/tests/truncated_string.c b/dtc/tests/truncated_string.c
new file mode 100644
index 000000000..d7454147b
--- /dev/null
+++ b/dtc/tests/truncated_string.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for misbehaviour on a truncated string
+ * Copyright (C) 2018 David Gibson, IBM Corporation.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+int main(int argc, char *argv[])
+{
+	void *fdt = &truncated_string;
+	const struct fdt_property *good, *bad;
+	int off, len;
+	const char *name;
+
+	test_init(argc, argv);
+
+	vg_prepare_blob(fdt, fdt_totalsize(fdt));
+
+	off = fdt_first_property_offset(fdt, 0);
+	good = fdt_get_property_by_offset(fdt, off, NULL);
+
+	off = fdt_next_property_offset(fdt, off);
+	bad = fdt_get_property_by_offset(fdt, off, NULL);
+
+	if (fdt32_to_cpu(good->len) != 0)
+		FAIL("Unexpected length for good property");
+	name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len);
+	if (!name)
+		FAIL("fdt_get_string() failed on good property: %s",
+		     fdt_strerror(len));
+	if (len != 4)
+		FAIL("fdt_get_string() returned length %d (not 4) on good property",
+		     len);
+	if (!streq(name, "good"))
+		FAIL("fdt_get_string() returned \"%s\" (not \"good\") on good property",
+		     name);
+
+	if (fdt32_to_cpu(bad->len) != 0)
+		FAIL("Unexpected length for bad property\n");
+	name = fdt_get_string(fdt, fdt32_to_cpu(bad->nameoff), &len);
+	if (name)
+		FAIL("fdt_get_string() succeeded incorrectly on bad property");
+	else if (len != -FDT_ERR_TRUNCATED)
+		FAIL("fdt_get_string() gave unexpected error on bad property: %s",
+		     fdt_strerror(len));
+
+	/* Make sure the 'good' property breaks correctly if we
+	 * truncate the strings section */
+	fdt_set_size_dt_strings(fdt, fdt32_to_cpu(good->nameoff) + 4);
+	name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len);
+	if (name)
+		FAIL("fdt_get_string() succeeded incorrectly on mangled property");
+	else if (len != -FDT_ERR_TRUNCATED)
+		FAIL("fdt_get_string() gave unexpected error on mangled property: %s",
+		     fdt_strerror(len));
+
+	PASS();
+}