From c2e7727f4689230e806272b830db251ffd4d210e Mon Sep 17 00:00:00 2001
From: Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
Date: Mon, 10 Oct 2016 15:25:33 +0200
Subject: [PATCH] usb: add range check to UTF-16 string copy

---
 repos/os/include/usb/types.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/repos/os/include/usb/types.h b/repos/os/include/usb/types.h
index 28ce656c32..dc95be31b2 100644
--- a/repos/os/include/usb/types.h
+++ b/repos/os/include/usb/types.h
@@ -73,6 +73,10 @@ struct Usb::String
 	void copy(unsigned len, void *from, Genode::Allocator *md_alloc)
 	{
 		length = len;
+
+		if (len == 0)
+			return;
+
 		string = (utf16_t *)md_alloc->alloc(length * sizeof(utf16_t));
 		Genode::memcpy(string, from, sizeof(utf16_t) * length);
 	}