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| author | jhendersonHDF <jhenderson@hdfgroup.org> | 2023-10-28 04:20:29 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-10-28 04:20:29 (GMT) |
| commit | edb5cffdb20ad959c80b665cb8c2589f4c71414d (patch) | |
| tree | 12731836af8100c34415f3e4aea744f814f2f242 | |
| parent | 1bcef50b864fb1ea6e00900b3982e71d183cfda5 (diff) | |
| download | hdf5-edb5cffdb20ad959c80b665cb8c2589f4c71414d.zip hdf5-edb5cffdb20ad959c80b665cb8c2589f4c71414d.tar.gz hdf5-edb5cffdb20ad959c80b665cb8c2589f4c71414d.tar.bz2 | |
Avoid attempted use of NULL pointer in parallel compression code (#3786)
The parallel compression test code tests for the case where all MPI ranks have no selection in a dataset when writing to it. Add an early exit to the code to avoid attempting to use a NULL pointer due to there being no work to do.
| -rw-r--r-- | src/H5Dmpio.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/H5Dmpio.c b/src/H5Dmpio.c index 16243fa..b40ab4b 100644 --- a/src/H5Dmpio.c +++ b/src/H5Dmpio.c @@ -3782,6 +3782,10 @@ H5D__mpio_redistribute_shared_chunks_int(H5D_filtered_collective_io_info_t *chun counts_disps_array = H5MM_xfree(counts_disps_array); } + /* No useful work to do - exit */ + if (coll_chunk_list_num_entries == 0) + HGOTO_DONE(SUCCEED); + /* * Phase 2 - Involved ranks now redistribute any shared chunks to new * owners as necessary. |