[PATCH] kthread: potential dereference of null pointer

[Jiasheng Jiang]

The return value of kzalloc() needs to be checked.
To avoid use of null pointer in case of the failure of alloc.

Fixes: dc6a87f5450d ("sched: Make the idle task quack like a per-CPU kthread")
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
---
 kernel/kthread.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 08931e525dd9..3feefeff4922 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -101,6 +101,8 @@ void set_kthread_struct(struct task_struct *p)
 		return;
 
 	kthread = kzalloc(sizeof(*kthread), GFP_KERNEL);
+	if (!kthread)
+		return;
 	/*
 	 * We abuse ->set_child_tid to avoid the new member and because it
 	 * can't be wrongly copied by copy_process(). We also rely on fact
-- 
2.25.1