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gh-111178: fix UBSan failures in Modules/_randommodule.c #129791

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Merged
merged 5 commits into from
Feb 21, 2025
Merged

gh-111178: fix UBSan failures in Modules/_randommodule.c #129791

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3beb26b
fix UBSan failures for `RandomObject`
picnixz Jan 25, 2025
141c72a
suppress unused return values
picnixz Jan 25, 2025
eadbd4f
Merge remote-tracking branch 'upstream/main' into fix/ubsan/random-11…
picnixz Feb 7, 2025
07f950e
Do Do not use `_` + capital letter in new code as it is also UB.
picnixz Feb 8, 2025
c7371c8
Merge branch 'main' into fix/ubsan/random-111178
encukou Feb 21, 2025
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7 changes: 4 additions & 3 deletions Modules/_randommodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,7 @@ typedef struct {
uint32_t state[N];
} RandomObject;

#define RandomObject_CAST(op) ((RandomObject *)(op))

#include "clinic/_randommodule.c.h"

Expand Down Expand Up @@ -551,7 +552,7 @@ _random_Random_getrandbits_impl(RandomObject *self, int k)
}

static int
random_init(RandomObject *self, PyObject *args, PyObject *kwds)
random_init(PyObject *self, PyObject *args, PyObject *kwds)
{
PyObject *arg = NULL;
_randomstate *state = _randomstate_type(Py_TYPE(self));
Expand All @@ -570,7 +571,7 @@ random_init(RandomObject *self, PyObject *args, PyObject *kwds)
if (PyTuple_GET_SIZE(args) == 1)
arg = PyTuple_GET_ITEM(args, 0);

return random_seed(self, arg);
return random_seed(RandomObject_CAST(self), arg);
}


Expand Down Expand Up @@ -665,7 +666,7 @@ _random_clear(PyObject *module)
static void
_random_free(void *module)
{
_random_clear((PyObject *)module);
(void)_random_clear((PyObject *)module);
}

static struct PyModuleDef _randommodule = {
Expand Down
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