Fix constant integer overflow in irk_rand_uint32_vec - #155
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* removes setup.py and generate_mklrand_c.py * updates pyproject.toml * adds meson.build
we search for MKL with cmake. Also drop pkg-config from meta.yamls and use cmake
remove tbb from build-with-clang workflow
aligns more closely with conda-forge feedstock
Declare the shift variable as npy_uint32 instead of npy_int32. The right-hand side ((npy_uint32)INT_MAX + 1) equals 2**31, which does not fit in a signed 32-bit integer and wrapped to INT32_MIN when stored. All downstream uses (lo - shift, hi - shift + 1U, res[i] += shift) already operate on the unsigned bit pattern via modulo-2**32 arithmetic, so behavior is bit-for-bit identical. This removes the Coverity INTEGER_OVERFLOW finding (CID 652701) and the out-of-range signed conversion it relied on.
antonwolfy
requested review from
jharlow-intel,
ndgrigorian,
vlad-perevezentsev and
xaleryb
as code owners
August 10, 2026 11:03
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Recreating this PR on top of master instead of the build-with-meson branch. |
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Summary
Fixes Coverity
INTEGER_OVERFLOWinirk_rand_uint32_vecinmkl_random/src/mkl_distributions.cpp.The
shiftvariable was declared asnpy_int32, but its initializer:evaluates to
2**31 = 2147483648, which does not fit in a signed 32-bit integer. Storing it wrapped toINT32_MIN— an out-of-range signed conversion that Coverity flags as an overflowed constant.Fix
Declare
shiftasnpy_uint32. Both2**31and2**31 + 1(theif (lo) shift++;case) fit in an unsigned 32-bit integer, so the overflow disappears.