From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50113) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gH78C-0000CL-CX for qemu-devel@nongnu.org; Mon, 29 Oct 2018 08:58:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gH78B-0002X9-KT for qemu-devel@nongnu.org; Mon, 29 Oct 2018 08:58:56 -0400 Received: from smtp.nue.novell.com ([195.135.221.5]:38725) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gH78B-0002Vo-Ah for qemu-devel@nongnu.org; Mon, 29 Oct 2018 08:58:55 -0400 From: Fei Li Date: Mon, 29 Oct 2018 20:58:14 +0800 Message-Id: <20181029125818.28720-4-fli@suse.com> In-Reply-To: <20181029125818.28720-1-fli@suse.com> References: <20181029125818.28720-1-fli@suse.com> Subject: [Qemu-devel] [PATCH RFC v6 3/7] qemu_thread_join: fix segmentation fault List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: armbru@redhat.com, dgilbert@redhat.com, famz@redhat.com, peterx@redhat.com, quintela@redhat.com To avoid the segmentation fault in qemu_thread_join(), just directly return when the QemuThread *thread failed to be created in either qemu-thread-posix.c or qemu-thread-win32.c. Signed-off-by: Fei Li Reviewed-by: Fam Zheng --- util/qemu-thread-posix.c | 3 +++ util/qemu-thread-win32.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c index dfa66ff2fb..289af4fab5 100644 --- a/util/qemu-thread-posix.c +++ b/util/qemu-thread-posix.c @@ -562,6 +562,9 @@ void *qemu_thread_join(QemuThread *thread) int err; void *ret; + if (!thread->thread) { + return NULL; + } err = pthread_join(thread->thread, &ret); if (err) { error_exit(err, __func__); diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c index 4a363ca675..1a27e1cf6f 100644 --- a/util/qemu-thread-win32.c +++ b/util/qemu-thread-win32.c @@ -366,7 +366,7 @@ void *qemu_thread_join(QemuThread *thread) HANDLE handle; data = thread->data; - if (data->mode == QEMU_THREAD_DETACHED) { + if (data == NULL || data->mode == QEMU_THREAD_DETACHED) { return NULL; } -- 2.13.7