[PATCH 4/5] lib/create: fix memory leak, ensure *database=NULL on error

Subject: [PATCH 4/5] lib/create: fix memory leak, ensure *database=NULL on error

Date: Sat, 23 Oct 2021 06:24:50 -0300

To: Austin Ray, notmuch@notmuchmail.org

Cc: David Bremner

From: David Bremner


This code previously relied on _finish_open to free the notmuch struct
on errors (except for the case of database == NULL, which was a
potential double free). When we removed those frees from _finish_open,
we introduced a (small) memory leak.

In this commit, fix the memory leak, and harmonize the on-error
behaviour with n_d_open_with_config.
---
 lib/open.cc            | 10 ++++++++--
 test/T590-libconfig.sh |  2 --
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/open.cc b/lib/open.cc
index 77f01f72..6fa00a84 100644
--- a/lib/open.cc
+++ b/lib/open.cc
@@ -714,10 +714,16 @@ notmuch_database_create_with_config (const char *database_path,
 	else
 	    free (message);
     }
+    if (status && notmuch) {
+	notmuch_database_destroy (notmuch);
+	notmuch = NULL;
+    }
+
     if (database)
 	*database = notmuch;
-    else
-	talloc_free (notmuch);
+
+    if (notmuch)
+	notmuch->open = true;
     return status;
 }
 
diff --git a/test/T590-libconfig.sh b/test/T590-libconfig.sh
index b36653bf..cd7d6e24 100755
--- a/test/T590-libconfig.sh
+++ b/test/T590-libconfig.sh
@@ -893,7 +893,6 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "create: database set to null on missing config"
-test_subtest_known_broken
 test_C ${MAIL_DIR} "/nonexistent" <<EOF
 #include <notmuch-test.h>
 int main (int argc, char **argv) {
@@ -912,7 +911,6 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "create: database set to null on missing config (env)"
-test_subtest_known_broken
 old_NOTMUCH_CONFIG=${NOTMUCH_CONFIG}
 NOTMUCH_CONFIG="/nonexistent"
 test_C ${MAIL_DIR} <<EOF
-- 
2.33.0
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