From fd9847c808c421a201ae574d93f6d0ea36d9ec63 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sun, 15 Jul 2018 00:58:37 +0000
Subject: Mwrap.dump: do not segfault on invalid IO arg

Users may screw up ordering of arguments :x
---
 ext/mwrap/mwrap.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'ext/mwrap/mwrap.c')

diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index 3f59f11..c160e33 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -346,6 +346,7 @@ static VALUE mwrap_dump(int argc, VALUE * argv, VALUE mod)
 		io = *((VALUE *)dlsym(RTLD_DEFAULT, "rb_stderr"));
 
 	a.min = NIL_P(min) ? 0 : NUM2SIZET(min);
+	io = rb_io_get_io(io);
 	io = rb_io_get_write_io(io);
 	GetOpenFile(io, fptr);
 	a.fp = rb_io_stdio_file(fptr);
-- 
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