[Qemu-devel] [PATCH for-4.0 v8 7/7] qemu_thread_join: fix segmentation fault

[Fei Li <fli@suse.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.

Cc: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Fei Li <fli@suse.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
---
 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 81b40a1ece..cb3722a4f4 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -566,6 +566,9 @@ 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 57b1143e97..ca4d5329e3 100644
--- a/util/qemu-thread-win32.c
+++ b/util/qemu-thread-win32.c
@@ -367,7 +367,7 @@ 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