merge revision(s) 1cdf8ab07b24ebd16e93621957196e8b1d67f2ba: [Backport #19323]

	[Bug #19323] Raise `RangeError` instead of integer overflow

	---
	 bignum.c                  |  5 ++++-
	 test/ruby/test_integer.rb | 18 ++++++++----------
	 2 files changed, 12 insertions(+), 11 deletions(-)

1 files changed, 4 insertions, 1 deletions

diff --git a/bignum.c b/bignum.c
index f83fbe2c14..26c7011b1f 100644
--- a/bignum.c
+++ b/bignum.c
@@ -4569,11 +4569,14 @@ big_shift3(VALUE x, int lshift_p, size_t shift_numdigits, int shift_numbits)
 
     if (lshift_p) {
         if (LONG_MAX < shift_numdigits) {
-            rb_raise(rb_eArgError, "too big number");
+          too_big:
+            rb_raise(rb_eRangeError, "shift width too big");
         }
         s1 = shift_numdigits;
         s2 = shift_numbits;
+        if ((size_t)s1 != shift_numdigits) goto too_big;
         xn = BIGNUM_LEN(x);
+        if (LONG_MAX/SIZEOF_BDIGIT <= xn+s1) goto too_big;
         z = bignew(xn+s1+1, BIGNUM_SIGN(x));
         zds = BDIGITS(z);
         BDIGITS_ZERO(zds, s1);