0001-Fix-memory-leaks-from-incorrect-strsep-uses.patch

From 1b842bfdc2b303264134687f3ec21fd3e53a0c82 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Wed, 16 Oct 2024 09:37:54 +0200
Subject: [PATCH] Fix memory leaks from incorrect strsep() uses

Commit 5d2e1cc117b introduced some strsep() uses, but it did the
memory management wrong in some cases.  We need to keep a separate
pointer to the allocate memory so that we can free it later, because
strsep() advances the pointer we pass to it, and it at the end it
will be NULL, so any free() calls won't do anything.

(This fixes two of the four places changed in commit 5d2e1cc117b.  The
other two don't have this problem.)

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/79692bf9-17d3-41e6-b9c9-fc8c3944222a@eisentraut.org
---
 src/common/logging.c          | 3 ++-
 src/test/regress/pg_regress.c | 7 +++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/common/logging.c b/src/common/logging.c
index aedd1ae2d8c..3cf119090a5 100644
--- a/src/common/logging.c
+++ b/src/common/logging.c
@@ -120,8 +120,9 @@ pg_logging_init(const char *argv0)
 			if (colors)
 			{
 				char	   *token;
+				char	   *cp = colors;
 
-				while ((token = strsep(&colors, ":")))
+				while ((token = strsep(&cp, ":")))
 				{
 					char	   *e = strchr(token, '=');
 
diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 5157629b1cc..6c188954b14 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -233,14 +233,17 @@ free_stringlist(_stringlist **listhead)
 static void
 split_to_stringlist(const char *s, const char *delim, _stringlist **listhead)
 {
-	char	   *sc = pg_strdup(s);
 	char	   *token;
+	char	   *sc;
+	char	   *tofree;
+
+	tofree = sc = pg_strdup(s);
 
 	while ((token = strsep(&sc, delim)))
 	{
 		add_stringlist_item(listhead, token);
 	}
-	free(sc);
+	free(tofree);
 }
 
 /*
-- 
2.47.0