From: Brandt Bucher <brandt@python.org>
Date: Thu, 16 Dec 2021 11:08:20 +0000 (-0800)
Subject: bpo-45829: Check `__getitem__`'s version for overflow before specializing (GH-30129)
X-Git-Tag: v3.11.0a4~187
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=62a8a0c5223f750e22ee381d3cfbdb718cf1cc93;p=thirdparty%2FPython%2Fcpython.git

bpo-45829: Check `__getitem__`'s version for overflow before specializing (GH-30129)

* Check __getitem__'s version for overflow.

* Use SPEC_FAIL_OUT_OF_VERSIONS instead
---

diff --git a/Python/specialize.c b/Python/specialize.c
index 7d4387b1639a..730e2f045ebe 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -1187,7 +1187,7 @@ _Py_Specialize_BinarySubscr(
         assert(cls->tp_version_tag != 0);
         cache0->version = cls->tp_version_tag;
         int version = _PyFunction_GetVersionForCurrentState(func);
-        if (version == 0) {
+        if (version == 0 || version != (uint16_t)version) {
             SPECIALIZATION_FAIL(BINARY_SUBSCR, SPEC_FAIL_OUT_OF_VERSIONS);
             goto fail;
         }