Avoid interger multiplication overflow

mame · mame · commit c348a4fd7ae7 · 2024-11-08T19:48:56.000+09:00
diff --git a/bignum.c b/bignum.c
@@ -6311,6 +6311,7 @@ rb_big_pow(VALUE x, VALUE y)
 
             if (xbits == (size_t)-1 ||
                 (xbits > BIGLEN_LIMIT) ||
+                MUL_OVERFLOW_LONG_P(yy, xbits) ||
                 (xbits * yy > BIGLEN_LIMIT)) {
                 rb_raise(rb_eArgError, "exponent is too large");
             }

Original file line number	Diff line number	Diff line change
`@@ -6311,6 +6311,7 @@ rb_big_pow(VALUE x, VALUE y)`
`6311`	`6311`
`6312`	`6312`	`if (xbits == (size_t)-1 \|\|`
`6313`	`6313`	`(xbits > BIGLEN_LIMIT) \|\|`
	`6314`	`+ MUL_OVERFLOW_LONG_P(yy, xbits) \|\|`
`6314`	`6315`	`(xbits * yy > BIGLEN_LIMIT)) {`
`6315`	`6316`	`rb_raise(rb_eArgError, "exponent is too large");`
`6316`	`6317`	`}`