gh-102701: Fix overflow in dictobject.c

python · Mar 16, 2023 · 0102cf0 · 0102cf0
1 parent 1c9f339
commit 0102cf0
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diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst b/Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst
@@ -0,0 +1 @@
+Fix overflow when creating very large dict.
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
@@ -596,7 +596,7 @@ new_keys_object(PyInterpreterState *interp, uint8_t log2_size, bool unicode)
 
     assert(log2_size >= PyDict_LOG_MINSIZE);
 
-    usable = USABLE_FRACTION(1<<log2_size);
+    usable = USABLE_FRACTION((size_t)1<<log2_size);
     if (log2_size < 8) {
         log2_bytes = log2_size;
     }