From: Stan Ulbrych <stan@python.org>
Date: Tue, 9 Jun 2026 19:45:54 +0000 (+0100)
Subject: gh-151112: Fix double free in `assemble_init` when out of memory (#151142)
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=580499177ca91477b53b4a40afcec7d3370265b0;p=thirdparty%2FPython%2Fcpython.git

gh-151112: Fix double free in `assemble_init` when out of memory (#151142)
---

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-12-24-35.gh-issue-151112.4RKCkD.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-12-24-35.gh-issue-151112.4RKCkD.rst
new file mode 100644
index 000000000000..93ee5c8cf191
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-12-24-35.gh-issue-151112.4RKCkD.rst
@@ -0,0 +1 @@
+Fix a crash in the compiler that could occur when running out of memory.
diff --git a/Python/assemble.c b/Python/assemble.c
index 3df959c36341..8bcb4c7bf3a9 100644
--- a/Python/assemble.c
+++ b/Python/assemble.c
@@ -80,9 +80,9 @@ assemble_init(struct assembler *a, int firstlineno)
     }
     return SUCCESS;
 error:
-    Py_XDECREF(a->a_bytecode);
-    Py_XDECREF(a->a_linetable);
-    Py_XDECREF(a->a_except_table);
+    Py_CLEAR(a->a_bytecode);
+    Py_CLEAR(a->a_linetable);
+    Py_CLEAR(a->a_except_table);
     return ERROR;
 }