Then, in the ECPGdump_a_type() function, this 5th parameter is defined as ind_name and is passed as the 3rd parameter to: ``` ECPGdump_a_struct(o, name, ind_name, str_one, type, ind_type, prefix, ind_prefix); ``` In ECPGdump_a_struct(), there is a dereference of the ind_name pointer: ``` char *ind_pbuf = (char *) mm_alloc(strlen(ind_name) + ((ind_prefix == NULL) ? 0 : strlen(ind_prefix)) + 3); ```
Here, if ind_name == NULL, calling strlen(ind_name) would cause a process crash (segmentation fault).
To demonstrate that this can never happen and that the analyzer is mistaken, let’s look at the condition under which ECPGdump_a_struct() is called from ECPGdump_a_type(): ``` switch (type->type) { case ECPGt_struct: ```
That is, only if the processed variable is of type struct.
However, output_get_descr() never processes structs — it only works with descriptors.
The field type->type (which is v->type) comes from: ``` const struct variable *v = find_variable(results->variable); ```
But in output_get_descr(), we process descriptor fields (SQLDA), and results->value is one of the descriptor’s fields.
All these fields are primitive types, not structs: ``` /* descriptor items */ enum ECPGdtype { ECPGd_count = 1, ECPGd_data, ECPGd_di_code, ECPGd_di_precision, ECPGd_indicator, ECPGd_key_member, ECPGd_length, ECPGd_name, ECPGd_nullable, ECPGd_octet, ECPGd_precision, ECPGd_ret_length, ECPGd_ret_octet, ECPGd_scale, ECPGd_type, ECPGd_EODT, /* End of descriptor types. */ ECPGd_cardinality };
```
Therefore, ECPGdump_a_struct() will never be called from output_get_descr() because:
v->type->type will never be ECPGt_struct in this context;
results->value refers to descriptor fields, not C structs.
Consequently, a call to strlen(ind_name) with ind_name == NULL is unreachable.
