Fix various issues related to https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=66523 (!1504) · Merge requests · poppler / poppler

Even Rouault requested to merge rouault/poppler:fix_ossfuzz_66523 into master Feb 20, 2024

All those fixes contribue to avoid (ulimit -v 2000000; utils/pdftoppm clusterfuzz-testcase-minimized-gdal_filesystem_fuzzer-5567544853331968) to abort() or crash on nullptr dereference or integer overflow

clusterfuzz-testcase-minimized-gdal_filesystem_fuzzer-5567544853331968

Fix various issues related to https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=66523

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