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1518b7d76a
pg_dump expects a read request of zero bytes to be a no-op; see for example ReadStr(). Gzip_read got this wrong and falsely supposed that the resulting gzret == 0 indicated an error. We could complicate that error-checking logic some more, but it seems best to just fall out immediately when passed size == 0. This bug breaks the nominally-supported case of manually gzip'ing the toc.dat file within a directory-style dump, so back-patch to v16 where this code came in. (Prior branches already have a short-circuit for size == 0 before their only gzread call.) Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/3515357.1760128017@sss.pgh.pa.us Backpatch-through: 16