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bb02eba534
Since commit 62d712ecfd, pg_stat_statements has been underestimating
the size of the result buffer possible for a normalized query, in cases
where the query includes many squashable lists, causing the normalized
query to write past the allocated area.
The allocated buffer size forgot to account for the comment appended in
a squashable list, "/*, ... */". Instead of trying to track down
precisely how much space we need, fix by switch to using an expansible
StringInfo. This not only fixes the bug, but it also makes the code
simpler to follow.
Author: Álvaro Herrera <alvherre@kurilemu.de>
Reported-by: Sajeeb Lohani with TrendAI Zero Day Initiative
Reported-by: Yuelin Wang <3020001251@tju.edu.cn>
Diagnosed-by: Michaël Paquier <michael@paquier.xyz>
Backpatch-through: 18
Security: CVE-2026-14676
Discussion: https://postgr.es/m/19528-7290dd7e6f7dcc22@postgresql.org
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.