mmappend.c: Avoid invalid access for header entry

gdraheim / zziplib

The ZZIPlib provides read access on ZIP-archives and unpacked data. It features an additional simplified API following the standard Posix API for file access

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mmappend.c: Avoid invalid access for header entry #151

Closed keentux closed 5 months ago

keentux commented 7 months ago

zzip_disk_entry_to_file_header checking the pointer by substraction instead of addition where it could lead to an invalid access memory.
CVE-2020-18770 from #69