branches/zip: page_zip_compress(): Do not call deflate(&c_stream, Z_FULL_FLUSH)

unless more than 6 bytes are available for the output. This should remove the possibility that deflate() returns Z_OK without consuming all input.
18 years ago · 4b23d55164
1 changed files with 2 additions and 1 deletions
--- a/page/page0zip.c
+++ b/page/page0zip.c
@ -1142,7 +1142,8 @@ page_zip_compress(
 		trx_id_col = ULINT_UNDEFINED;
 	}

-	if (UNIV_UNLIKELY(c_stream.avail_out < n_dense * slot_size)) {
+	if (UNIV_UNLIKELY(c_stream.avail_out <= n_dense * slot_size
+			  + 6/* sizeof(zlib header and footer) */)) {
 		goto zlib_error;
 	}