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URL: https://github.com/python/cpython/issues/126980

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bytearray().__buffer__(256) crashes  #126980

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bytearray().__buffer__(256) crashes #126980
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sobolevn
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump
@sobolevn

Description

@sobolevn
sobolevn
opened on Nov 18, 2024

Crash report

Code says that it cannot fail:

cpython/Objects/bytearrayobject.c

Lines 44 to 56 in 4cd1076

static int
bytearray_getbuffer(PyObject *self, Py_buffer *view, int flags)
{
PyByteArrayObject *obj = _PyByteArray_CAST(self);
if (view == NULL) {
PyErr_SetString(PyExc_BufferError,
"bytearray_getbuffer: view==NULL argument is obsolete");
return -1;
}
void *ptr = (void *) PyByteArray_AS_STRING(obj);
/* cannot fail if view != NULL and readonly == 0 */
(void)PyBuffer_FillInfo(view, (PyObject*)obj, ptr, Py_SIZE(obj), 0, flags);

But, it can:

cpython/Objects/abstract.c

Lines 770 to 774 in 4cd1076

if (flags != PyBUF_SIMPLE) { /* fast path */
if (flags == PyBUF_READ || flags == PyBUF_WRITE) {
PyErr_BadInternalCall();
return -1;
}

I have a PR ready.

CC @JelleZijlstra

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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump

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