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bpo-43132: Fix incorrect handling of PyObject_RichCompareBool() in _zoneinfo (GH-24450) (GH-24457)

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PyObject_RichCompareBool() returns -1 on error, but this case is
not handled by the find_in_strong_cache() function.  Any exception
raised by PyObject_RichCompareBool() should be propagated.
(cherry picked from commit effaec0bb5)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-02-05 09:13:40 -08:00 • committed by GitHub
parent b0b01811bb
commit c8b4375fe1
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 6 deletions
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23
Modules/_zoneinfo.c
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@ -163,7 +163,7 @@ is_leap_year(int year);
static size_t
_bisect(const int64_t value, const int64_t *arr, size_t size);
static void
static int
eject_from_strong_cache(const PyTypeObject *const type, PyObject *key);
static void
clear_strong_cache(const PyTypeObject *const type);
@ -265,7 +265,7 @@ zoneinfo_new(PyTypeObject *type, PyObject *args, PyObject *kw)
}
PyObject *instance = zone_from_strong_cache(type, key);
if (instance != NULL) {
if (instance != NULL || PyErr_Occurred()) {
return instance;
}
@ -428,7 +428,10 @@ zoneinfo_clear_cache(PyObject *cls, PyObject *args, PyObject *kwargs)
while ((item = PyIter_Next(iter))) {
// Remove from strong cache
eject_from_strong_cache(type, item);
if (eject_from_strong_cache(type, item) < 0) {
Py_DECREF(item);
break;
}
// Remove from weak cache
PyObject *tmp = PyObject_CallMethodObjArgs(weak_cache, pop, item,
@ -2347,7 +2350,11 @@ find_in_strong_cache(const StrongCacheNode *const root, PyObject *const key)
{
const StrongCacheNode *node = root;
while (node != NULL) {
if (PyObject_RichCompareBool(key, node->key, Py_EQ)) {
int rv = PyObject_RichCompareBool(key, node->key, Py_EQ);
if (rv < 0) {
return NULL;
}
if (rv) {
return (StrongCacheNode *)node;
}
@ -2361,11 +2368,11 @@ find_in_strong_cache(const StrongCacheNode *const root, PyObject *const key)
*
* This function is used to enable the per-key functionality in clear_cache.
*/
static void
static int
eject_from_strong_cache(const PyTypeObject *const type, PyObject *key)
{
if (type != &PyZoneInfo_ZoneInfoType) {
return;
return 0;
}
StrongCacheNode *node = find_in_strong_cache(ZONEINFO_STRONG_CACHE, key);
@ -2374,6 +2381,10 @@ eject_from_strong_cache(const PyTypeObject *const type, PyObject *key)
strong_cache_node_free(node);
}
else if (PyErr_Occurred()) {
return -1;
}
return 0;
}
/* Moves a node to the front of the LRU cache.