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-rw-r--r--Objects/unicodeobject.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 2175655039..00a6a36fcd 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1384,13 +1384,18 @@ find_maxchar_surrogates(const wchar_t *begin, const wchar_t *end,
for (iter = begin; iter < end; ) {
#if SIZEOF_WCHAR_T == 2
- if (Py_UNICODE_IS_HIGH_SURROGATE(iter[0])
- && (iter+1) < end
- && Py_UNICODE_IS_LOW_SURROGATE(iter[1]))
- {
- ch = Py_UNICODE_JOIN_SURROGATES(iter[0], iter[1]);
- ++(*num_surrogates);
- iter += 2;
+ if (Py_UNICODE_IS_HIGH_SURROGATE(iter[0])) {
+ if ((iter+1) < end
+ && Py_UNICODE_IS_LOW_SURROGATE(iter[1]))
+ {
+ ch = Py_UNICODE_JOIN_SURROGATES(iter[0], iter[1]);
+ ++(*num_surrogates);
+ iter += 2;
+ }
+ else {
+ PyErr_SetString(PyExc_ValueError, "illegal UTF-16 surrogate");
+ return -1;
+ }
}
else
#endif