From ea8c7e9054abf23fa3de2f8e4414f60ac8a8b620 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 19 Mar 2014 11:09:24 -0400
Subject: [PATCH] Fix memory leak during regular expression execution.
For a regex containing backrefs, pg_regexec() might fail to free all the
sub-DFAs that were created during execution, resulting in a permanent
(session lifespan) memory leak. Problem was introduced by me in commit
587359479acbbdc95c8e37da40707e37097423f5. Per report from Sandro Santilli;
diagnosis by Greg Stark.
---
src/backend/regex/regexec.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/backend/regex/regexec.c b/src/backend/regex/regexec.c
index 0edb83c1099..2e976627f52 100644
--- a/src/backend/regex/regexec.c
+++ b/src/backend/regex/regexec.c
@@ -259,6 +259,7 @@ pg_regexec(regex_t *re,
/* clean up */
if (v->pmatch != pmatch && v->pmatch != mat)
FREE(v->pmatch);
+ n = (size_t) v->g->ntree;
for (i = 0; i < n; i++)
{
if (v->subdfas[i] != NULL)
--
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