[Backport release/3.10] Fix read heap-buffer-overflow on nested /vsitar/ calls #11642
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Fixes https://issues.oss-fuzz.com/issues/388868487 This is just a band-aid... The use of CPLFormFilename() and friends is so dangerous with the rotating TLS buffers that may end up overwritten if too many calls are nested...
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Backport #11638
Authored by: @rouault