PGSQL ODBC driver crash in CC_get_current_schema

Hi,

we are using the PostgreSQL 9.2.4 with ODBC driver 09.03.0400.

We experience a driver crash when, for some reason (e.g. insufficient permissions), there is no schema set.

This happens because the strdup in the CC_get_current_schema function in connection.c is executed while the 'select current_schema()' query returned NULL.

We have created a patch to workaround the strdup when the result of QR_get_value_backend_text is NULL:

# diff connection.c.orig connection.c
4073c4073,4081
<                               conn->current_schema = strdup(QR_get_value_backend_text(res, 0, 0));
---
>                       {
>                               const char* value = QR_get_value_backend_text(res, 0, 0);
>
>                               if (value == NULL)
>                                       conn->current_schema = NULL;
>                               else
>                                       conn->current_schema = strdup(value);
>
>                       }

We have tested this patch in our environment and didn't experience any problems. However, we don't oversee the entire code, but expect this not to give any more problems.

Would you be able to include this patch in the next release of the ODBC driver? Feel free to contact in case of any questions.