Fix: SBO in icFixXml()

[ChrisCoxArt]

Fixes #624

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

2026-03-01 01:12:01 UTC

mkdir pr-634
cd pr-634
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git fetch origin pull/634/head:pr-634
git checkout pr-634
cd Build
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=Debug -Wno-dev -DCMAKE_CXX_FLAGS="-g -fsanitize=address,undefined -fno-sanitize=leak -fno-omit-frame-pointer -Wall" -DENABLE_TOOLS=ON -DENABLE_STATIC_LIBS=ON -DENABLE_SHARED_LIBS=ON Cmake > cmake.log 2>&1
make -j32
wget https://github.com/xsscx/fuzz/raw/refs/heads/master/graphics/icc/sbo-icFixXml-IccUtilXml_cpp-Line314.icc
Tools/IccToXml/iccToXml sbo-icFixXml-IccUtilXml_cpp-Line314.icc foo.bar

Expected Output

[2026-03-01 01:12:17 UTC] ~/pr-634/iccDEV/Build (pr-634)$ git log --oneline --graph -1
* da22c53 (HEAD -> pr-634, origin/issue-624) make sure prefix and suffix are null terminated
[2026-03-01 01:12:18 UTC] ~/pr-634/iccDEV/Build (pr-634)$ Tools/IccToXml/iccToXml sbo-icFixXml-IccUtilXml_cpp-Line314.icc foo.bar
XML successfully created