From e13e6ffc5468066ac780bfb098540ceffb8cf201 Mon Sep 17 00:00:00 2001
From: Lekensteyn <lekensteyn@gmail.com>
Date: Thu, 1 Mar 2012 13:16:48 +0100
Subject: [PATCH] Fix null deref when ACPI method call failed (GH-12)

---
 bbswitch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bbswitch.c b/bbswitch.c
index f0cd673..f1eb431 100644
--- a/bbswitch.c
+++ b/bbswitch.c
@@ -74,7 +74,7 @@ int dis_before_suspend_disabled;
 static char *buffer_to_string(const char *buffer, size_t n, char *target) {
     int i;
     for (i=0; i<n; i++) {
-        snprintf(target + i * 5, 5 * (n - i), "%02X,", buffer[i]);
+        snprintf(target + i * 5, 5 * (n - i), "%02X,", buffer ? buffer[i] : 0);
     }
     return target;
 }