write.c: correctly handle no existing blob table during overwrite

diff --git a/src/write.c b/src/write.c
index 930c61b1d5dad40f0694102c061d4b2514c3f6cb..f3308a24c14f88ffa47b579680c2e484a040b936 100644 (file)
--- a/src/write.c
+++ b/src/write.c
@@ -3110,8 +3110,11 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, unsigned num_threads)
                 * this data would be overwritten.  */
                old_xml_begin = wim->hdr.xml_data_reshdr.offset_in_wim;
                old_xml_end = old_xml_begin + wim->hdr.xml_data_reshdr.size_in_wim;
-               old_blob_table_end = wim->hdr.blob_table_reshdr.offset_in_wim +
-                                    wim->hdr.blob_table_reshdr.size_in_wim;
+               if (wim->hdr.blob_table_reshdr.offset_in_wim == 0)
+                       old_blob_table_end = WIM_HEADER_DISK_SIZE;
+               else
+                       old_blob_table_end = wim->hdr.blob_table_reshdr.offset_in_wim +
+                                            wim->hdr.blob_table_reshdr.size_in_wim;
                if (wim_has_integrity_table(wim) &&
                    wim->hdr.integrity_table_reshdr.offset_in_wim < old_xml_end) {
                        WARNING("Didn't expect the integrity table to be "