From 5211f7bb0bc68764ff34412d3f4fddcfdab99a4c Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 22 Oct 2014 04:46:52 +0800
Subject: [PATCH] lsusb-t: handle problem if there is no usb bus list

Check to see if we really have a list of usb busses before we start
walking it.

Thanks to Benoit Izac <benoit@izac.org> for pointing out the fix.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 lsusb-t.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lsusb-t.c b/lsusb-t.c
index a849d4c..f1fab3b 100644
--- a/lsusb-t.c
+++ b/lsusb-t.c
@@ -607,6 +607,8 @@ static void sort_busses(void)
 	int swapped;
 	do {
 		p = usbbuslist;
+		if (p == NULL)
+			return;
 		pp = &usbbuslist;
 		swapped = 0;
 		while (p && p->next) {
-- 
1.8.3.1