Fix: NPD in CIccTagXmlStruct::ParseTag()

[ChrisCoxArt]

Fixes #633

Pull Request Checklist

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• 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 03:18:38 UTC

mkdir pr-639
cd pr-639
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git fetch origin pull/639/head:pr-639
git checkout pr-639
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/xml/icc/segv-CIccTagXmlStruct-ParseTag-IccTagXml_cpp-Line4738.xml
ASAN_OPTIONS=detect_leaks=0,print_scariness=1  iccFromXml segv-CIccTagXmlStruct-ParseTag-IccTagXml_cpp-Line4738.xml foo.bar

Expected Output

ASAN_OPTIONS=detect_leaks=0,print_scariness=1 Tools/IccFromXml/iccFromXml segv-CIccTagXmlStruct-ParseTag-IccTagXml_cpp-Line4738.xml foo.bar
Profile parsed.  Profile is invalid, but saved correctly
Error! -  - Unknown 'c%eN' = 6325654E: Unknown profile class!
Error! - Both Colorimetric PCS or Spectral PCS are not defined!
Warning! - Header date - 0: Invalid year!
Warning! - Header date - 0: Invalid month!
Warning! - Header date - 0: Invalid day!
NonCompliant! - Required tags missing.
Error! - Unknown Profile Class.