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coll/base: fix memory allocation in mca_coll_base_alltoall_intra_basi… #687

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Oct 19, 2015
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coll/base: fix memory allocation in mca_coll_base_alltoall_intra_basi… #687

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6 changes: 4 additions & 2 deletions ompi/mca/coll/basic/coll_basic_alltoall.c
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ mca_coll_basic_alltoall_intra_inplace(void *rbuf, int rcount,
MPI_Request *preq;
char *tmp_buffer;
size_t max_size;
ptrdiff_t ext;
ptrdiff_t ext, true_lb, true_ext;

/* Initialize. */

Expand All @@ -57,13 +57,15 @@ mca_coll_basic_alltoall_intra_inplace(void *rbuf, int rcount,

/* Find the largest receive amount */
ompi_datatype_type_extent (rdtype, &ext);
max_size = ext * rcount;
ompi_datatype_get_true_extent ( rdtype, &true_lb, &true_ext);
max_size = true_ext + ext * (rcount-1);

/* Allocate a temporary buffer */
tmp_buffer = calloc (max_size, 1);
if (NULL == tmp_buffer) {
return OMPI_ERR_OUT_OF_RESOURCE;
}
max_size = ext * rcount;

/* in-place alltoall slow algorithm (but works) */
for (i = 0 ; i < size ; ++i) {
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