[PATCH 2/4] tests: Enhance truncated_memrsv to test fdt_open_into()

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We already check that libfdt's r/o functions can deal properly with
malformed blobs, where the memreserve block is not correct.

Add a test for fdt_open_into(), which also queries the memreserve block,
and uses the return value as an offset into a buffer.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
 tests/truncated_memrsv.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tests/truncated_memrsv.c b/tests/truncated_memrsv.c
index d78036c..9defef3 100644
--- a/tests/truncated_memrsv.c
+++ b/tests/truncated_memrsv.c
@@ -18,7 +18,8 @@
 int main(int argc, char *argv[])
 	void *fdt = &truncated_memrsv;
-	int err;
+	char *buf;
+	int err, bufsize;
 	uint64_t addr, size;
 	test_init(argc, argv);
@@ -46,5 +47,12 @@ int main(int argc, char *argv[])
 		FAIL("fdt_get_mem_rsv(1) returned %d instead of -FDT_ERR_BADOFFSET",
+	bufsize = fdt_totalsize(fdt);
+	buf = xmalloc(bufsize);
+	err = fdt_open_into(fdt, buf, bufsize);
+	if (err != -FDT_ERR_TRUNCATED)
+		FAIL("fdt_open_into() returned %d instead of -FDT_ERR_TRUNCATED",
+		     err);

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