Avoid out-of-bounds dims read for a scalar HDF5 dataspace#319
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naruto-lgtm wants to merge 1 commit into
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Avoid out-of-bounds dims read for a scalar HDF5 dataspace#319naruto-lgtm wants to merge 1 commit into
naruto-lgtm wants to merge 1 commit into
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Repro: open a v7.3 file with a numeric dataset stored as a scalar (rank-0) HDF5 dataspace and marked MATLAB_empty, or a sparse variable whose ir/jc/data subdataset is stored the same way.
Cause: Mat_H5ReadDims sizes its result with malloc(*rank * sizeof(size_t)), so a scalar dataspace gives malloc(0); Mat_H5ReadDatasetInfo's empty branch and the sparse ir/jc/data readers in Mat_VarRead73 then read dims[0] off that zero-length buffer (ASan heap-buffer-overflow read at mat73.c:920 and :3204).
Fix: return one zeroed element for a scalar dataspace so dims[0] stays in bounds. rank stays 0, so the struct-field reader that already special-cases a scalar is unchanged and the malformed empty/sparse datasets are rejected downstream.