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bpo-43362: Fix invalid free and return check in _sha3 module (GH-25463) #25463

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Merged
merged 1 commit into from
Apr 18, 2021
Merged

bpo-43362: Fix invalid free and return check in _sha3 module (GH-25463) #25463

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Security/2021-04-18-00-56-44.bpo-43362.__5aiP.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix invalid free in _sha3 module. The issue was introduced in 3.10.0a1.
Python 3.9 and earlier are not affected.
12 changes: 9 additions & 3 deletions Modules/_sha3/sha3module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -193,15 +193,16 @@ static PyObject *
py_sha3_new_impl(PyTypeObject *type, PyObject *data, int usedforsecurity)
/*[clinic end generated code: output=90409addc5d5e8b0 input=bcfcdf2e4368347a]*/
{
HashReturn res;
Py_buffer buf = {NULL, NULL};
SHA3State *state = PyType_GetModuleState(type);
SHA3object *self = newSHA3object(type);
if (self == NULL) {
goto error;
}

SHA3State *state = PyType_GetModuleState(type);
assert(state != NULL);

HashReturn res;
if (type == state->sha3_224_type) {
res = Keccak_HashInitialize_SHA3_224(&self->hash_state);
} else if (type == state->sha3_256_type) {
Expand Down Expand Up @@ -229,7 +230,12 @@ py_sha3_new_impl(PyTypeObject *type, PyObject *data, int usedforsecurity)
goto error;
}

Py_buffer buf = {NULL, NULL};
if (res != SUCCESS) {
PyErr_SetString(PyExc_RuntimeError,
"internal error in SHA3 initialize()");
goto error;
}

if (data) {
GET_BUFFER_VIEW_OR_ERROR(data, &buf, goto error);
if (buf.len >= HASHLIB_GIL_MINSIZE) {
Expand Down