log0recv.c:

  Fix a wrong memset in InnoDB Hot Backup code; the bug probably did not affect anything since we do not assume that the header of a log file is filled with zeros before writing the header info there; the bug found by Felix von Leitner

innobase/log/log0recv.c

@@ -2990,8 +2990,7 @@ recv_reset_log_files_for_backup(
 	memcpy(name + log_dir_len, logfilename, sizeof logfilename);
 
 	buf = ut_malloc(LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE);
-        memset(buf, LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE, '\0');
-
+        memset(buf, '\0', LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE);
 
 	for (i = 0; i < n_log_files; i++) {