Author: cem
Date: Sat Apr 14 04:35:10 2018
New Revision: 332499
URL: https://svnweb.freebsd.org/changeset/base/332499
Log:
expr(1): Fix overflow detection when operand is INTMAX_MIN
PR: 227329
Submitted by: Tobias Stoeckmann <tobias AT stoeckmann.org>
Modified:
head/bin/expr/expr.y
Modified: head/bin/expr/expr.y
==============================================================================
--- head/bin/expr/expr.y Sat Apr 14 03:15:05 2018 (r332498)
+++ head/bin/expr/expr.y Sat Apr 14 04:35:10 2018 (r332499)
@@ -422,11 +422,9 @@ op_plus(struct val *a, struct val *b)
void
assert_minus(intmax_t a, intmax_t b, intmax_t r)
{
- /* special case subtraction of INTMAX_MIN */
- if (b == INTMAX_MIN && a < 0)
+ if ((a >= 0 && b < 0 && r <= 0) ||
+ (a < 0 && b > 0 && r >= 0))
errx(ERR_EXIT, "overflow");
- /* check addition of negative subtrahend */
- assert_plus(a, -b, r);
}
struct val *
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