Messages in this thread Patch in this message | | | From | Chao Liu <> | Subject | [PATCH] cpu/hotplug: check the return value of idle_thread_get | Date | Mon, 27 Mar 2023 20:37:28 +0000 |
| |
ilde may be ERR_PTR()
Signed-off-by: Chao Liu <liuchao173@huawei.com> --- kernel/cpu.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/cpu.c b/kernel/cpu.c index d0a9aa0b42e8..8ddf372e8d29 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -590,6 +590,9 @@ static int bringup_cpu(unsigned int cpu) struct task_struct *idle = idle_thread_get(cpu); int ret; + if (IS_ERR(idle)) + return PTR_ERR(idle); + /* * Reset stale stack state from the last time this CPU was online. */ @@ -614,7 +617,12 @@ static int bringup_cpu(unsigned int cpu) static int finish_cpu(unsigned int cpu) { struct task_struct *idle = idle_thread_get(cpu); - struct mm_struct *mm = idle->active_mm; + struct mm_struct *mm = NULL; + + if (IS_ERR(idle)) + return PTR_ERR(idle); + + mm = idle->active_mm; /* * idle_task_exit() will have switched to &init_mm, now -- 2.23.0
| |