Fix: SO in SIccCalcOp::ArgsUsed()

[ChrisCoxArt]

And compare that to the op count before adding so we don't overflow 32 bits. Fixes #669

Pull Request Checklist

• Have you followed the guidelines in Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you built your Pull Request locally with the Build Instructions?
• Have you added or updated relevant tests?
• Have you added or updated relevant docs?

[xsscx]

Maintainer Review

2026-03-15 00:32:50 UTC

Repro

mkdir pr-684
cd pr-684
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV/Build
git fetch origin pull/684/head:pr-684
git checkout pr-684
export CXX=clang++ && export CXXFLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer -g -O1 -fprofile-arcs -ftest-coverage" && export LDFLAGS="-fsanitize=address,undefined -fprofile-arcs" && cmake Cmake -DCMAKE_BUILD_TYPE=Debug -DENABLE_ASAN=ON -DENABLE_UBSAN=ON -DENABLE_COVERAGE=ON
make -j$(nproc)
        cd ../Testing/
        echo "=== Updating PATH ==="
         for d in ../Build/Tools/*; do
          [ -d "$d" ] && export PATH="$(realpath "$d"):$PATH"
         done
wget https://github.com/xsscx/research/raw/refs/heads/main/test-profiles/ios-gen-p3-1x1.tif
wget https://github.com/xsscx/fuzz/raw/refs/heads/master/graphics/icc/so-CIccCalculatorFunc-CheckUnderflowOverflow-IccMpeCalc_cpp-Line4152.icc
iccApplyProfiles ios-gen-p3-1x1.tif /dev/null 0 0 0 0 0 so-CIccCalculatorFunc-CheckUnderflowOverflow-IccMpeCalc_cpp-Line4152.icc 0    

PR Appliction Output

Error 3 - Unable to begin profile application - Possibly invalid or incompatible profiles