Memory Leak Detected in lib7zip When Parsing Malformed XZ Files

[vsheludchenkov-nord]

Hi,

While testing malformed files, we identified a memory leak in lib7zip that occurs when the library fails to parse an XZ archive.

Please use the attached test file (test.xz) to reproduce and verify the issue.
test.xz.zip

Best regards,
Vitalii Sheludchenkov

[ip7z]

I'll fix the code for that memory leak.
I can fix it in this function or in Xzs_ReadBackward function that calls that function.
Thanks!