From 5217dd5f61a0b537417816e3b1143320f976396b Mon Sep 17 00:00:00 2001
From: jhendersonHDF <jhenderson@hdfgroup.org>
Date: Fri, 1 Sep 2023 12:37:07 -0500
Subject: Fix an issue with use of uninitialized memory in trefer_deprec.c test
 (#3422) (#3471)

---
 test/trefer_deprec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/trefer_deprec.c b/test/trefer_deprec.c
index f39e93c..209708b 100644
--- a/test/trefer_deprec.c
+++ b/test/trefer_deprec.c
@@ -772,6 +772,7 @@ test_reference_region(H5F_libver_t libver_low, H5F_libver_t libver_high)
     CHECK(ret, FAIL, "H5Dread");
 
     /* Try to read an unaddressed dataset */
+    memset(&undef_reg, 0, sizeof(undef_reg));
     dset2 = H5Rdereference2(dset1, dapl_id, H5R_DATASET_REGION, undef_reg);
     VERIFY(dset2, FAIL, "H5Rdereference2 haddr_undef");
 
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