Обсуждение: BUG #18797: pointer te->defn not checked for NULL

The following bug has been logged on the website:

Bug reference:      18797
Logged by:          Daniel Elishakov
Email address:      dan-eli@mail.ru
PostgreSQL version: 16.6
Operating system:   ubuntu 20.04
Description:

src/interfaces/ecpg/pgtypeslib/dt_common.c:2662
src/interfaces/ecpg/pgtypeslib/dt_common.c:2787
src/interfaces/ecpg/pgtypeslib/dt_common.c:2795
src/interfaces/ecpg/pgtypeslib/dt_common.c:2840
in function PGTYPEStimestamp_defmt_scan there is a usage of pgtypes_alloc().
In other functions the result of pgtypes_alloc is being checked for NULL.
For example, in /src/interfaces/ecpg/pgtypeslib/numeric.c. I think in
PGTYPEStimestamp_defmt_scan it is also worth checking for NULL before
dereferencing in strcpy, because PGTYPEStimestamp_defmt_scan is being called
recursively and if there won't be any available memory to allocate, it can
be a real problem in terms of data consistency.