sh: Avoid undefined behaviour shifting negative values left in arithmetic.

With i386 base clang, arith_yacc.o remains unchanged.
svn path=/head/; revision=266947
2014-06-01 11:25:34 +00:00 · 2014-06-01 11:25:34 +00:00 · b0762e4921 · 2020-12-20 02:59:44 +00:00
commit b0762e4921
parent dd5a01badc
1 changed files with 1 additions and 1 deletions
--- a/bin/sh/arith_yacc.c
+++ b/bin/sh/arith_yacc.c
@ -139,7 +139,7 @@ static arith_t do_binop(int op, arith_t a, arith_t b)
 	case ARITH_SUB:
 		return (uintmax_t)a - (uintmax_t)b;
 	case ARITH_LSHIFT:
-		return a << b;
+		return (uintmax_t)a << b;
 	case ARITH_RSHIFT:
 		return a >> b;
 	case ARITH_LT: