Author: jilles
Date: Tue Nov 8 23:54:39 2011
New Revision: 227369
URL: http://svn.freebsd.org/changeset/base/227369
Log:
sh: Remove undefined behaviour due to overflow in +/-/* in arithmetic.
With i386 base gcc and i386 base clang, arith_yacc.o remains unchanged.
Modified:
head/bin/sh/arith_yacc.c
Modified: head/bin/sh/arith_yacc.c
==============================================================================
--- head/bin/sh/arith_yacc.c Tue Nov 8 23:44:26 2011 (r227368)
+++ head/bin/sh/arith_yacc.c Tue Nov 8 23:54:39 2011 (r227369)
@@ -131,11 +131,11 @@ static arith_t do_binop(int op, arith_t
yyerror("divide error");
return op == ARITH_REM ? a % b : a / b;
case ARITH_MUL:
- return a * b;
+ return (uintmax_t)a * (uintmax_t)b;
case ARITH_ADD:
- return a + b;
+ return (uintmax_t)a + (uintmax_t)b;
case ARITH_SUB:
- return a - b;
+ return (uintmax_t)a - (uintmax_t)b;
case ARITH_LSHIFT:
return a << b;
case ARITH_RSHIFT:
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