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gh-111178: fix UBSan failures in Modules/_lzmamodule.c #129783

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Merged
merged 5 commits into from
Feb 18, 2025
Merged

gh-111178: fix UBSan failures in Modules/_lzmamodule.c #129783

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d47be9d
fix UBSan failures for LZMA objects
picnixz Jan 25, 2025
f9fc53d
suppress unused return values
picnixz Jan 25, 2025
1b5ba72
Merge remote-tracking branch 'upstream/main' into fix/ubsan/lzma-111178
picnixz Feb 7, 2025
9a20625
Do not use `_` + capital letter in new code as it is also UB.
picnixz Feb 8, 2025
f9aadde
Merge branch 'main' into fix/ubsan/lzma-111178
encukou Feb 17, 2025
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19 changes: 12 additions & 7 deletions Modules/_lzmamodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,9 @@ typedef struct {
PyThread_type_lock lock;
} Decompressor;

#define Compressor_CAST(op) ((Compressor *)(op))
#define Decompressor_CAST(op) ((Decompressor *)(op))

/* Helper functions. */

static int
Expand Down Expand Up @@ -857,14 +860,15 @@ Compressor_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
}

static void
Compressor_dealloc(Compressor *self)
Compressor_dealloc(PyObject *op)
{
Compressor *self = Compressor_CAST(op);
lzma_end(&self->lzs);
if (self->lock != NULL) {
PyThread_free_lock(self->lock);
}
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
tp->tp_free(self);
Py_DECREF(tp);
}

Expand All @@ -875,7 +879,7 @@ static PyMethodDef Compressor_methods[] = {
};

static int
Compressor_traverse(Compressor *self, visitproc visit, void *arg)
Compressor_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -1304,8 +1308,9 @@ _lzma_LZMADecompressor_impl(PyTypeObject *type, int format,
}

static void
Decompressor_dealloc(Decompressor *self)
Decompressor_dealloc(PyObject *op)
{
Decompressor *self = Decompressor_CAST(op);
if(self->input_buffer != NULL)
PyMem_Free(self->input_buffer);

Expand All @@ -1315,12 +1320,12 @@ Decompressor_dealloc(Decompressor *self)
PyThread_free_lock(self->lock);
}
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
tp->tp_free(self);
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Shouldn't this be op?

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tp_free takes a void * as input, so it doesn't matter. I've chosen the one that reduces the diff (but honestly, I don't know whether I've always been consistent)

Py_DECREF(tp);
}

static int
Decompressor_traverse(Decompressor *self, visitproc visit, void *arg)
Decompressor_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -1633,7 +1638,7 @@ lzma_clear(PyObject *module)
static void
lzma_free(void *module)
{
lzma_clear((PyObject *)module);
(void)lzma_clear((PyObject *)module);
}

static PyModuleDef _lzmamodule = {
Expand Down
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