thread_info: Fix crash when requesting for thread that never ran

* kern/thread.c (thread_info): Set last_processor to 0 when the thread
never ran.

1 files changed, 4 insertions, 3 deletions

diff --git a/kern/thread.c b/kern/thread.c
index dfc6ff68..903fb559 100644
--- a/kern/thread.c
+++ b/kern/thread.c
@@ -1613,10 +1613,11 @@ kern_return_t thread_info(
 	    sched_info->depress_priority = thread->depress_priority;
 
 #if NCPUS > 1
-	    sched_info->last_processor = thread->last_processor->slot_num;
-#else
-	    sched_info->last_processor = 0;
+	    if (thread->last_processor)
+		sched_info->last_processor = thread->last_processor->slot_num;
+	    else
 #endif
+		sched_info->last_processor = 0;
 
 	    thread_unlock(thread);
 	    splx(s);