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gh-144069: Fix memory leak in _dbm.open() on failure #144075

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gh-144069: Fix memory leak in _dbm.open() on failure #144075

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91d78af
gh-144069: Fix memory leak in _dbm.open() on failure
VanshAgarwal24036 Jan 20, 2026
8bdd53c
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VanshAgarwal24036 Jan 20, 2026
32c8cca
gh-144069: Fix cleanup in _dbm deallocation
VanshAgarwal24036 Jan 21, 2026
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5 changes: 5 additions & 0 deletions Lib/test/test_dbm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,11 @@ def test_error(self):
def test_anydbm_not_existing(self):
self.assertRaises(dbm.error, dbm.open, _fname)

def test_open_nonexistent_directory(self):
missing_dir = os.path.join(dirname + "_does_not_exist", "test.db")
with self.assertRaises(OSError):
dbm.open(missing_dir, "c")

def test_anydbm_creation(self):
f = dbm.open(_fname, 'c')
self.assertEqual(list(f.keys()), [])
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C_API/2026-01-20-20-17-16.gh-issue-144069.IE5fug.rst
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@@ -0,0 +1,2 @@
Fix a memory leak in :func:`dbm.open` when database creation fails, such as
when the target directory does not exist.
4 changes: 3 additions & 1 deletion Modules/_dbmmodule.c
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Expand Up @@ -85,10 +85,11 @@ newdbmobject(_dbm_state *state, const char *file, int flags, int mode)
}
dp->di_size = -1;
dp->flags = flags;
dp->di_dbm = NULL;
PyObject_GC_Track(dp);

/* See issue #19296 */
if ( (dp->di_dbm = dbm_open((char *)file, flags, mode)) == 0 ) {
if ( (dp->di_dbm = dbm_open((char *)file, flags, mode)) == NULL ) {
PyErr_SetFromErrnoWithFilename(state->dbm_error, file);
Py_DECREF(dp);
return NULL;
Expand All @@ -105,6 +106,7 @@ dbm_dealloc(PyObject *self)
PyObject_GC_UnTrack(dp);
if (dp->di_dbm) {
dbm_close(dp->di_dbm);
dp->di_dbm = NULL;
}
PyTypeObject *tp = Py_TYPE(dp);
tp->tp_free(dp);
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