kern: fix error handling

This avoids calling `thread_deallocate' with an uninitialized value,
as found by the Clang Static Analyzer.

* kern/thread.c (kernel_thread): Fix error handling.

1 files changed, 5 insertions, 1 deletions

diff --git a/kern/thread.c b/kern/thread.c
index 8b1e9f5..1f47553 100644
--- a/kern/thread.c
+++ b/kern/thread.c
@@ -1667,9 +1667,13 @@ thread_t kernel_thread(
 	continuation_t	start,
 	void *		arg)
 {
+	kern_return_t	kr;
 	thread_t	thread;
 
-	(void) thread_create(task, &thread);
+	kr = thread_create(task, &thread);
+	if (kr != KERN_SUCCESS)
+		return THREAD_NULL;
+
 	/* release "extra" ref that thread_create gave us */
 	thread_deallocate(thread);
 	thread_start(thread, start);