shyouhei	2018-11-14 18:53:11 +0900 (Wed, 14 Nov 2018)

  New Revision: 65725

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65725

  Log:
    numeric.c: avoid division by zero
    
    same as r65642.

  Modified files:
    trunk/rational.c
Index: rational.c
===================================================================
--- rational.c	(revision 65724)
+++ rational.c	(revision 65725)
@@ -929,8 +929,11 @@ nurat_div(VALUE self, VALUE other) https://github.com/ruby/ruby/blob/trunk/rational.c#L929
 			    other, ONE, '/');
 	}
     }
-    else if (RB_FLOAT_TYPE_P(other))
-	return DBL2NUM(nurat_to_double(self) / RFLOAT_VALUE(other));
+    else if (RB_FLOAT_TYPE_P(other)) {
+	double d = nurat_to_double(self);
+	VALUE v = rb_float_new(d);
+	return rb_flo_div_flo(v, other);
+    }
     else if (RB_TYPE_P(other, T_RATIONAL)) {
 	if (f_zero_p(other))
             rb_num_zerodiv();
@@ -968,7 +971,7 @@ nurat_fdiv(VALUE self, VALUE other) https://github.com/ruby/ruby/blob/trunk/rational.c#L971
 {
     VALUE div;
     if (f_zero_p(other))
-	return DBL2NUM(nurat_to_double(self) / 0.0);
+	return nurat_div(self, rb_float_new(0.0));
     if (FIXNUM_P(other) && other == LONG2FIX(1))
 	return nurat_to_f(self);
     div = nurat_div(self, other);

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