Fix #432, read over the end of mem block applying attribute add

src/sphinxrt.cpp

@@ -8025,6 +8025,7 @@ bool RtIndex_t::AddRemoveAttribute ( bool bAdd, const CSphString & sAttrName, ES
	SphOptimizeGuard_t tStopOptimize ( m_tOptimizingLock, m_bOptimizeStop ); // got write-locked at daemon

	int iOldStride = m_iStride;
	int iOldRowSize = m_tSchema.GetRowSize();
	const CSphColumnInfo * pNewAttr = NULL;
	CSphSchema tOldSchema = m_tSchema;

@@ -8063,7 +8064,7 @@ bool RtIndex_t::AddRemoveAttribute ( bool bAdd, const CSphString & sAttrName, ES
			{
				SphDocID_t uDocId = DOCINFO2ID ( pOldDocinfo );
				DWORD * pAttrs = DOCINFO2ATTRS ( pOldDocinfo );
				memcpy ( DOCINFO2ATTRS ( pNewDocinfo ), pAttrs, m_tSchema.GetRowSize()*sizeof(CSphRowitem) );
				memcpy ( DOCINFO2ATTRS ( pNewDocinfo ), pAttrs, iOldRowSize*sizeof(CSphRowitem) );
				sphSetRowAttr ( DOCINFO2ATTRS ( pNewDocinfo ), pNewAttr->m_tLocator, 0 );
				DOCINFOSETID ( pNewDocinfo, uDocId );
				pOldDocinfo += iOldStride;