bug fix - https://github.com/lua/lua/commit/42cf5f8214edf45400c7e4abd6faef27cf424801

2026-05-12 11:18:11 -07:00 · 2024-02-04 11:25:31 +01:00
parent 2f5de9ed0a
commit 2592aeb85e
1 changed files with 3 additions and 1 deletions
@@ -128,7 +128,9 @@ static int b_rot(lua_State *L, int i) {
    b_uint r = luaL_checkunsigned(L, 1);
    i &= (LUA_NBITS - 1);  /* i = i % NBITS */
    r = trim(r);
-    r = (r << i) | (r >> (LUA_NBITS - i));
+    if (i != 0)  /* avoid undefined shift of LUA_NBITS when i == 0 */
+        r = (r << i) | (r >> (LUA_NBITS - i));
+
    lua_pushunsigned(L, trim(r));
    return 1;
 }