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Tied hashes, and probably tied arrays, are capable of returning Perl value pointers that are actually NULL, not the usual pointer to an undef SV. We were not defending against that everywhere, leading to possible SIGSEGV. Fix the code to consistently treat a null pointer returned from hv_iternext or av_fetch like a !SvOK one. (Note that the large diff in SV_to_JsonbValue is actually quite trivial, but it required reindenting a chunk of existing code.) Claude Code found the instance in hstore_plperl, and I found the others by code auditing. Perhaps the other instances aren't actually reachable, but I see little reason to assume that. The known test cases for these errors require perl's Tie modules, which may not be present, so it doesn't seem worth the trouble to create regression test cases that would cover them. Reported-by: Claude Code (via Noah Misch) Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/569769.1786901901@sss.pgh.pa.us Backpatch-through: 14
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.