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-rw-r--r--release_docs/RELEASE.txt12
-rw-r--r--src/H5Glink.c19
2 files changed, 26 insertions, 5 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index 0bd31a0..986b1e8 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -385,6 +385,18 @@ Bug Fixes since HDF5-1.10.3 release
(JTH - 2018/08/25, HDFFV-10501)
+ - When iterating over an old-style group (i.e., when not using the latest
+ file format) of size 0, a NULL pointer representing the empty links
+ table would be sent to qsort(3) for sorting, which is undefined behavior.
+
+ Iterating over an empty group is explicitly tested in the links test.
+ This has not caused any failures to date and was flagged by gcc's
+ -fsanitize=undefined.
+
+ The library no longer attempts to sort an empty array.
+
+ (DER - 2019/06/18, HDFFV-10829)
+
Java Library:
----------------
- JNI native library dependencies
diff --git a/src/H5Glink.c b/src/H5Glink.c
index 82a2dcf..04ccbc5 100644
--- a/src/H5Glink.c
+++ b/src/H5Glink.c
@@ -402,15 +402,14 @@ done:
/*-------------------------------------------------------------------------
- * Function: H5G__link_sort_table
+ * Function: H5G__link_sort_table
*
* Purpose: Sort table containing a list of links for a group
*
- * Return: Success: Non-negative
- * Failure: Negative
+ * Return: SUCCEED/FAIL
*
- * Programmer: Quincey Koziol
- * Nov 20, 2006
+ * Programmer: Quincey Koziol
+ * Nov 20, 2006
*
*-------------------------------------------------------------------------
*/
@@ -418,11 +417,20 @@ herr_t
H5G__link_sort_table(H5G_link_table_t *ltable, H5_index_t idx_type,
H5_iter_order_t order)
{
+ herr_t ret_value = SUCCEED;
+
FUNC_ENTER_PACKAGE_NOERR
/* Sanity check */
HDassert(ltable);
+ /* Can't sort when empty since the links table will be NULL */
+ if(0 == ltable->nlinks)
+ HGOTO_DONE(ret_value);
+
+ /* This should never be NULL if the number of links is non-zero */
+ HDassert(ltable->lnks);
+
/* Pick appropriate sorting routine */
if(idx_type == H5_INDEX_NAME) {
if(order == H5_ITER_INC)
@@ -442,6 +450,7 @@ H5G__link_sort_table(H5G_link_table_t *ltable, H5_index_t idx_type,
HDassert(order == H5_ITER_NATIVE);
} /* end else */
+done:
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G__link_sort_table() */