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* Reject chunked datasets with mismatched chunk/dspace rank H5D__chunk_construct() validates that the chunk layout dimensionality matches the dataspace rank, but that runs only at dataset creation time. When an existing dataset is opened, H5D__chunk_init() didn't repeat the check, so a file whose stored chunk rank disagreed with its dataspace rank was accepted. During chunk I/O the memory-selection rank (from the dataspace) and the file-selection rank (chunk ndims - 1) then differ, which produces a zero stride that causes a divide-by-zero in H5S__hyper_iter_get_seq_list(). H5D__chunk_init() now performs the same dimensionality check on open (the stored chunk rank includes the extra element-size dimension, so it must be exactly one greater than the dataspace rank) and rejects a mismatch with an error. Added test_chunk_dims_mismatch() as a regression test in test/dsets.c Fixes #6491 * Fix typo Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Clarify element-vs-byte wording * Validate chunk/dataspace rank at layout decode time Move the stored-chunk-rank vs dataspace-rank consistency check out of H5D__chunk_init() and into H5O__layout_decode(), so a malformed chunked layout is rejected as the message is decoded (mirroring the fill/datatype size check in the fill message decode). * Update release_docs/CHANGELOG.md Co-authored-by: Larry Knox <lrknox@hdfgroup.org> * Update CHANGELOG * Pin format version bounds in bad chunk layout generator --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Larry Knox <lrknox@hdfgroup.org>