[Python-checkins] closes bpo-37446: resolve undefined behavior in Python/hamt.c (GH-17727)

[Miss Islington (bot)]

https://github.com/python/cpython/commit/a278ae19b4daa1deb11e2a8eed38838027e90ece
commit: a278ae19b4daa1deb11e2a8eed38838027e90ece
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2019-12-30T18:51:18-08:00
summary:

closes bpo-37446: resolve undefined behavior in Python/hamt.c (GH-17727)

(cherry picked from commit d0c92e81aa2171228a23cb2bed36f7dab975257d)

Co-authored-by: Batuhan Taşkaya <47358913+isidentical at users.noreply.github.com>

files:
M Python/hamt.c

diff --git a/Python/hamt.c b/Python/hamt.c
index 38412596a37b0..5efc8d7fabe8e 100644
--- a/Python/hamt.c
+++ b/Python/hamt.c
@@ -1864,7 +1864,7 @@ hamt_node_array_without(PyHamtNode_Array *self,
                     continue;
                 }
 
-                bitmap |= 1 << i;
+                bitmap |= 1U << i;
 
                 if (IS_BITMAP_NODE(node)) {
                     PyHamtNode_Bitmap *child = (PyHamtNode_Bitmap *)node;