gh-94332: make it safe to call assemble_free when assemble_init has not been called...

(cherry picked from commit be82d26570343dafc8a89be5a1a0e2f58d51a904)

diff --git a/Python/compile.c b/Python/compile.c
index 90fae6328f4164d27bf47267929ec9e7bfb22d31..ea2fdfdb60405f0d0837e5e2a7d0861620768370 100644 (file)
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -7116,6 +7116,7 @@ assemble(struct compiler *c, int addNone)
     int j, nblocks;
     PyCodeObject *co = NULL;
     PyObject *consts = NULL;
+    memset(&a, 0, sizeof(struct assembler));
 
     /* Make sure every block that falls off the end returns None.
        XXX NEXT_BLOCK() isn't quite right, because if the last