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tds5_process_dyn_result2: Don't trust Sybase w/blob params. #571

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tds5_process_dyn_result2: Don't trust Sybase w/blob params. #571

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26 changes: 25 additions & 1 deletion src/tds/token.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2687,6 +2687,7 @@ tds5_process_dyn_result2(TDSSOCKET * tds)
unsigned int col, num_cols;
TDSCOLUMN *curcol;
TDSPARAMINFO *info;
TDSDYNAMIC *dyn = NULL;

CHECK_TDS_EXTRA(tds);

Expand All @@ -2697,7 +2698,7 @@ tds5_process_dyn_result2(TDSSOCKET * tds)
if ((info = tds_alloc_results(num_cols)) == NULL)
return TDS_FAIL;
if (tds->cur_dyn) {
TDSDYNAMIC *dyn = tds->cur_dyn;
dyn = tds->cur_dyn;
tds_free_param_results(dyn->res_info);
dyn->res_info = info;
} else {
Expand Down Expand Up @@ -2740,6 +2741,29 @@ tds5_process_dyn_result2(TDSSOCKET * tds)
curcol->column_varint_size);
tdsdump_log(TDS_DBG_INFO1, "\tcolsize=%d prec=%d scale=%d\n",
curcol->column_size, curcol->column_prec, curcol->column_scale);

/*
* As of ASE 16.0, Sybase servers have started allowing
* dynamic query (prepared statement) declarations with
* IMAGE or (N)TEXT parameters. However, subsequent
* attempts to instantiate these queries have been failing
* with message 3805, "The token datastream length was not
* correct." In such cases, switch on dynamic query
* emulation (as already needed for older Sybase versions
* that immediately reject these declarations) and
* explicitly discard column information to avoid
* misconstruing the status of subsequent queries that
* yield no row results.
*/
if (dyn != NULL && is_blob_col(curcol)) {
dyn->emulated = 1;
tds_dynamic_deallocated(tds->conn, tds->cur_dyn);
dyn = NULL;
}
}

if (tds->cur_dyn != NULL && tds->cur_dyn->emulated) {
tds_set_current_results(tds, NULL);
}

return tds_alloc_row(info);
Expand Down