Fix a division by zero when multiplying 0 * y with SafeNumerics.

base/numerics/safe_math_impl.h

Index: base/numerics/safe_math_impl.h
diff --git a/base/numerics/safe_math_impl.h b/base/numerics/safe_math_impl.h
index c8451898bb522681c4d4761cb83a7656e556900f..08f2e88345f34d62870dcf16c569b126304f06f6 100644
--- a/base/numerics/safe_math_impl.h
+++ b/base/numerics/safe_math_impl.h
@@ -176,8 +176,8 @@ typename enable_if<std::numeric_limits<T>::is_integer&& std::numeric_limits<
                        T>::is_signed&&(sizeof(T) * 2 > sizeof(uintmax_t)),
                    T>::type
 CheckedMul(T x, T y, RangeConstraint* validity) {
-  // if either side is zero then the result will be zero.
-  if (!(x || y)) {

[jschuh, 2015/05/18 14:28:04]

fwiw, I think I intended this:

  if (!(x | y)) {

but, that's confusing and probably an unnecessary optimization.

+  // If either side is zero then the result will be zero.
+  if (!x || !y) {
     return RANGE_VALID;
 
   } else if (x > 0) {