From de2a0b8fa6c9f7dbee01ef989c4ca1f450a7af8b Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Thu, 3 Feb 2011 17:12:53 +0100
Subject: [PATCH] audiod get_play_time_slot_num(): Avoid possible NULL pointer
 dereference.

The pointer to the buffer tree node is dereferenced unconditionally
in btr_get_node_start(). This patch makes sure we never pass a NULL
pointer to this function.
---
 audiod_command.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/audiod_command.c b/audiod_command.c
index 05059ac0..a0d0229d 100644
--- a/audiod_command.c
+++ b/audiod_command.c
@@ -198,7 +198,7 @@ static int get_play_time_slot_num(void)
 	FOR_EACH_SLOT(i) {
 		struct slot_info *s = &slot[i];
 		struct timeval wstime;
-		if (!s->wns)
+		if (!s->wns || !s->wns[0].btrn)
 			continue;
 		btr_get_node_start(s->wns[0].btrn, &wstime);
 		if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
-- 
2.39.2