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When allocating a EVP context, it would have been possible to leak some memory allocated directly by OpenSSL, that PostgreSQL lost track of if the initialization of the context allocated failed. The cleanup can be done with EVP_MD_CTX_destroy(). Note that EVP APIs exist since OpenSSL 0.9.7 and we have in the tree equivalent implementations for older versions sincece9b75d(code removed with9b7cd59aas of 10~). However, in 9.5 and 9.6, the existing code makes use of EVP_MD_CTX_destroy() and EVP_MD_CTX_create() without an equivalent implementation when building the tree with OpenSSL 0.9.6 or older, meaning that this code is in reality broken with such versions since it got introduced ine2838c5. As we have heard no complains about that, it does not seem worth bothering with in 9.5 and 9.6, so I have left that out for simplicity. Author: Michael Paquier Discussion: https://postgr.es/m/20201015072212.GC2305@paquier.xyz Backpatch-through: 9.5
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.