From 2fcdd3f8eb3daa6efe4a25230a40f85499686c7e Mon Sep 17 00:00:00 2001 From: "Yukihiro \"Matz\" Matsumoto" Date: Wed, 29 Apr 2020 18:37:29 +0900 Subject: Add assertion as originally intended; ref #4986 --- mrbgems/mruby-io/src/io.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c index 3d9d2b48a..c0d2a51d7 100644 --- a/mrbgems/mruby-io/src/io.c +++ b/mrbgems/mruby-io/src/io.c @@ -1493,6 +1493,7 @@ mrb_io_readchar(mrb_state *mrb, mrb_value self) #endif mrb_get_args(mrb, "S", &buf); + mrb_assert(RSTRING_LEN(buf) > 0); mrb_assert(RSTRING_PTR(buf) != NULL); mrb_str_modify(mrb, RSTRING(buf)); #ifdef MRB_UTF8_STRING -- cgit v1.2.3