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gh-145376: Fix various reference leaks objects and modules #145385

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Merged
vstinner merged 10 commits into from
Mar 9, 2026
Merged

gh-145376: Fix various reference leaks objects and modules #145385

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f708b03
Fix reference leak in listiter_reduce_general
eendebakpt Mar 1, 2026
551a741
Fix reference leak in increment_longindex_lock_held
eendebakpt Mar 1, 2026
7015ae6
fix reference leak in count_nextlong
eendebakpt Mar 1, 2026
c02d2db
fix reference leak in count_nextlong
eendebakpt Mar 1, 2026
ff7709c
📜🤖 Added by blurb_it.
blurb-it[bot] Mar 1, 2026
edf016b
review comments
eendebakpt Mar 5, 2026
17f8799
remove news entry
eendebakpt Mar 5, 2026
a7c4497
review comments
eendebakpt Mar 5, 2026
14b2e7f
Apply suggestion from @eendebakpt
eendebakpt Mar 6, 2026
98252fa
Merge branch 'main' into refleaks
eendebakpt Mar 8, 2026
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-03-01-10-15-06.gh-issue-145376.lG5u1a.rst
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@@ -0,0 +1 @@
Fix reference leaks in various unusual error scenarios.
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@vstinner vstinner Mar 4, 2026

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I don't think that a NEWS entry is needed since it's unlikely to hit the issue, users are not directly impacted.

4 changes: 3 additions & 1 deletion Modules/itertoolsmodule.c
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Expand Up @@ -3538,8 +3538,10 @@ count_nextlong(countobject *lz)
if (long_cnt == NULL) {
/* Switch to slow_mode */
long_cnt = PyLong_FromSsize_t(PY_SSIZE_T_MAX);
if (long_cnt == NULL)
if (long_cnt == NULL) {
return NULL;
}
lz->long_cnt = long_cnt;
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}
assert(lz->cnt == PY_SSIZE_T_MAX && long_cnt != NULL);

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1 change: 1 addition & 0 deletions Objects/enumobject.c
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Expand Up @@ -184,6 +184,7 @@ increment_longindex_lock_held(enumobject *en)
if (next_index == NULL) {
return NULL;
}
en->en_longindex = next_index;
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}
assert(next_index != NULL);
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PyObject *stepped_up = PyNumber_Add(next_index, en->one);
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4 changes: 3 additions & 1 deletion Objects/listobject.c
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Expand Up @@ -4270,7 +4270,9 @@ listiter_reduce_general(void *_it, int forward)
}
/* empty iterator, create an empty list */
list = PyList_New(0);
if (list == NULL)
if (list == NULL) {
Py_DECREF(iter);
return NULL;
}
return Py_BuildValue("N(N)", iter, list);
}
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