[Python-checkins] bpo-36147: Fix a memory leak in ctypes s_get() (GH-12102)
Victor Stinner
webhook-mailer at python.org
Wed Mar 6 09:14:12 EST 2019
https://github.com/python/cpython/commit/098b139816f379271b8d4de2561b5805dd47d229
commit: 098b139816f379271b8d4de2561b5805dd47d229
branch: 2.7
author: stratakis <cstratak at redhat.com>
committer: Victor Stinner <vstinner at redhat.com>
date: 2019-03-06T15:14:06+01:00
summary:
bpo-36147: Fix a memory leak in ctypes s_get() (GH-12102)
The s_get() function leaks the result variable on low memory.
Partially backport commit 19b52545df898ec911c44e29f75badb902924c0
to fix it.
files:
M Modules/_ctypes/cfield.c
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 46f041b00e39..1b495fc9ac53 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -1291,24 +1291,16 @@ U_set(void *ptr, PyObject *value, Py_ssize_t length)
static PyObject *
s_get(void *ptr, Py_ssize_t size)
{
- PyObject *result;
- size_t slen;
+ Py_ssize_t i;
+ char *p;
- result = PyString_FromString((char *)ptr);
- if (!result)
- return NULL;
- /* chop off at the first NUL character, if any.
- * On error, result will be deallocated and set to NULL.
- */
- slen = strlen(PyString_AS_STRING(result));
- size = min(size, (Py_ssize_t)slen);
- if (result->ob_refcnt == 1) {
- /* shorten the result */
- _PyString_Resize(&result, size);
- return result;
- } else
- /* cannot shorten the result */
- return PyString_FromStringAndSize(ptr, size);
+ p = (char *)ptr;
+ for (i = 0; i < size; ++i) {
+ if (*p++ == '\0')
+ break;
+ }
+
+ return PyBytes_FromStringAndSize((char *)ptr, (Py_ssize_t)i);
}
static PyObject *
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