[PATCH] kvm: user: Call pthread_join only to created threads.

["Ryota OZAKI" <ozaki.ryota@gmail.com>]

Hi,

This patch fixes a bug in kvmtrace.

Thanks,
  ozaki-r

>From 4ccee3a01c2e8c377dc6a760b5d7802e58afda72 Mon Sep 17 00:00:00 2001
From: Ryota Ozaki <ozaki.ryota@gmail.com>
Date: Sat, 4 Oct 2008 15:30:48 +0900
Subject: [PATCH] kvm: user: Call pthread_join only to created threads.

If thread_main fails with a somewhat reason (e.g. open fails)
before all threads are created, pthread_join is called to a
uncreated thread and a segmentation fault occurs.

This patch checks whether a thread is created before calling
pthread_join to the thread.

Signed-off-by: Ryota Ozaki <ozaki.ryota@gmail.com>
---
 user/kvmtrace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/user/kvmtrace.c b/user/kvmtrace.c
index 876ac27..de3c189 100644
--- a/user/kvmtrace.c
+++ b/user/kvmtrace.c
@@ -454,7 +454,8 @@ static void stop_threads()
 	int i;

 	for_each_tip(tip, i) {
-		(void) pthread_join(tip->thread, (void *) &ret);
+		if (tip->thread)
+			(void) pthread_join(tip->thread, (void *) &ret);
 		close_thread(tip);
 	}
 }
-- 
1.5.4.1