Bugfix --sparse --diff mode

Originally reported in:
https://bugzilla.redhat.com/show_bug.cgi?id=1853469

* src/sparse.c (check_data_region): Only compare the part of buffer
really fed by safe_read(), not whole rdsize.

diff --git a/src/sparse.c b/src/sparse.c
index e60b16ad15d505e2016e69ef215ba41382b7dcd7..cc3c515b0b9da49dc4f0a61308eafac66db036b9 100644 (file)
--- a/src/sparse.c
+++ b/src/sparse.c
@@ -684,7 +684,7 @@ check_data_region (struct tar_sparse_file *file, size_t i)
        }
       size_left -= bytes_read;
       mv_size_left (file->stat_info->archive_file_size - file->dumped_size);
-      if (memcmp (blk->buffer, diff_buffer, rdsize))
+      if (memcmp (blk->buffer, diff_buffer, bytes_read))
        {
          report_difference (file->stat_info, _("Contents differ"));
          return false;