From a45ade88863e7e413ec408cdc62d60a1c1bc76a2 Mon Sep 17 00:00:00 2001
From: Dana Robinson <43805+derobins@users.noreply.github.com>
Date: Fri, 8 Jul 2022 12:10:29 -0700
Subject: Fix for memory allocation issue identified by fuzzer (#732) (#1860)

GitHub issue #732 claims that mallocing a particular buffer can
trigger undefined behavior and that callocing the buffer fixes
the issue.

I did not confirm this, but the fix is trivial and better anyway.
---
 src/H5Gcompact.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/H5Gcompact.c b/src/H5Gcompact.c
index d98e047..cc6113d 100644
--- a/src/H5Gcompact.c
+++ b/src/H5Gcompact.c
@@ -138,7 +138,7 @@ H5G__compact_build_table(const H5O_loc_t *oloc, const H5O_linfo_t *linfo, H5_ind
         H5O_mesg_operator_t op;    /* Message operator */
 
         /* Allocate the link table */
-        if ((ltable->lnks = (H5O_link_t *)H5MM_malloc(sizeof(H5O_link_t) * ltable->nlinks)) == NULL)
+        if ((ltable->lnks = (H5O_link_t *)H5MM_calloc(sizeof(H5O_link_t) * ltable->nlinks)) == NULL)
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
         /* Set up user data for iteration */
-- 
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