Get rid of undefined behavior

* string.c (rb_str_sub_bang): str and repl can be same. [Bug #15946]
dryruby · Jun 21, 2019 · 8f51da5 · 8f51da5
1 parent 50841ec
commit 8f51da5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/string.c b/string.c
@@ -5087,7 +5087,7 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str)
 	if (rlen != plen) {
 	    memmove(p + beg0 + rlen, p + beg0 + plen, len - beg0 - plen);
 	}
-	memcpy(p + beg0, rp, rlen);
+	memmove(p + beg0, rp, rlen);
 	len += rlen - plen;
 	STR_SET_LEN(str, len);
 	TERM_FILL(&RSTRING_PTR(str)[len], TERM_LEN(str));