Bug: Negation in 'luaV_shiftr' may overflow
Negation of an unchecked lua_Integer overflows with mininteger.
diff --git a/lvm.c b/lvm.c
index ec83f41..c84a665 100644
--- a/lvm.c
+++ b/lvm.c
@@ -766,7 +766,7 @@
/*
** Shift left operation. (Shift right just negates 'y'.)
*/
-#define luaV_shiftr(x,y) luaV_shiftl(x,-(y))
+#define luaV_shiftr(x,y) luaV_shiftl(x,intop(-, 0, y))
lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) {
if (y < 0) { /* shift right? */
diff --git a/testes/bitwise.lua b/testes/bitwise.lua
index 59781f5..9509f7f 100644
--- a/testes/bitwise.lua
+++ b/testes/bitwise.lua
@@ -45,6 +45,11 @@
-1 << numbits == 0 and
-1 << -numbits == 0)
+assert(1 >> math.mininteger == 0)
+assert(1 >> math.maxinteger == 0)
+assert(1 << math.mininteger == 0)
+assert(1 << math.maxinteger == 0)
+
assert((2^30 - 1) << 2^30 == 0)
assert((2^30 - 1) >> 2^30 == 0)
