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Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exception 

loss in PyTraceBack_Here().
This commit is contained in:
Serhiy Storchaka 2016-10-18 13:26:25 +03:00
parent c411a7d821 04eb777279
commit df0fd74ae8
2 changed files with 29 additions and 20 deletions
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3
Misc/NEWS
View File

@ -10,6 +10,9 @@ What's New in Python 3.6.0 beta 3
Core and Builtins
-----------------
- Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exception
loss in PyTraceBack_Here().
Library
-------

46
Python/traceback.c
View File

@ -132,47 +132,53 @@ newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
int
PyTraceBack_Here(PyFrameObject *frame)
{
PyThreadState *tstate = PyThreadState_GET();
PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
PyTracebackObject *tb = newtracebackobject(oldtb, frame);
if (tb == NULL)
PyObject *exc, *val, *tb, *newtb;
PyErr_Fetch(&exc, &val, &tb);
newtb = (PyObject *)newtracebackobject((PyTracebackObject *)tb, frame);
if (newtb == NULL) {
_PyErr_ChainExceptions(exc, val, tb);
return -1;
tstate->curexc_traceback = (PyObject *)tb;
Py_XDECREF(oldtb);
}
PyErr_Restore(exc, val, newtb);
Py_XDECREF(tb);
return 0;
}
/* Insert a frame into the traceback for (funcname, filename, lineno). */
void _PyTraceback_Add(const char *funcname, const char *filename, int lineno)
{
PyObject *globals = NULL;
PyCodeObject *code = NULL;
PyFrameObject *frame = NULL;
PyObject *exception, *value, *tb;
PyObject *globals;
PyCodeObject *code;
PyFrameObject *frame;
PyObject *exc, *val, *tb;
/* Save and clear the current exception. Python functions must not be
called with an exception set. Calling Python functions happens when
the codec of the filesystem encoding is implemented in pure Python. */
PyErr_Fetch(&exception, &value, &tb);
PyErr_Fetch(&exc, &val, &tb);
globals = PyDict_New();
if (!globals)
goto done;
goto error;
code = PyCode_NewEmpty(filename, funcname, lineno);
if (!code)
goto done;
if (!code) {
Py_DECREF(globals);
goto error;
}
frame = PyFrame_New(PyThreadState_Get(), code, globals, NULL);
Py_DECREF(globals);
Py_DECREF(code);
if (!frame)
goto done;
goto error;
frame->f_lineno = lineno;
PyErr_Restore(exception, value, tb);
PyErr_Restore(exc, val, tb);
PyTraceBack_Here(frame);
Py_DECREF(frame);
return;
done:
Py_XDECREF(globals);
Py_XDECREF(code);
Py_XDECREF(frame);
error:
_PyErr_ChainExceptions(exc, val, tb);
}
static PyObject *