From: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-committers@postgresql.org
Subject: pgsql: Fix low-probability memory leak in regex execution.
Date: Fri, 18 Sep 2015 17:55:44 +0000
Message-ID: <E1Zczsu-0005NH-NF@gemulon.postgresql.org> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-committers>
Fix low-probability memory leak in regex execution.
After an internal failure in shortest() or longest() while pinning down the
exact location of a match, find() forgot to free the DFA structure before
returning. This is pretty unlikely to occur, since we just successfully
ran the "search" variant of the DFA; but it could happen, and it would
result in a session-lifespan memory leak since this code uses malloc()
directly. Problem seems to have been aboriginal in Spencer's library,
so back-patch all the way.
In passing, correct a thinko in a comment I added awhile back about the
meaning of the "ntree" field.
I happened across these issues while comparing our code to Tcl's version
of the library.
Branch
------
REL9_1_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/28c396134e0640e21610a984b89393825753b30d
Modified Files
--------------
src/backend/regex/regexec.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--
Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-committers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-committers@postgresql.org
Cc: tgl@sss.pgh.pa.us
Subject: Re: pgsql: Fix low-probability memory leak in regex execution.
In-Reply-To: <E1Zczsu-0005NH-NF@gemulon.postgresql.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox