linux-kernel - [PATCH 3.16 150/204] workqueue: Fix NULL pointer dereference

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Message-ID: <lsq.1514480744.859375410@decadent.org.uk>
Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Lai Jiangshan" <jiangshanlai@...il.com>,
        "Li Bin" <huawei.libin@...wei.com>,
        "Xiaofei Tan" <tanxiaofei@...wei.com>, "Tejun Heo" <tj@...nel.org>
Subject: [PATCH 3.16 150/204] workqueue: Fix NULL pointer dereference

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Li Bin <huawei.libin@...wei.com>

commit cef572ad9bd7f85035ba8272e5352040e8be0152 upstream.

When queue_work() is used in irq (not in task context), there is
a potential case that trigger NULL pointer dereference.
----------------------------------------------------------------
worker_thread()
|-spin_lock_irq()
|-process_one_work()
	|-worker->current_pwq = pwq
	|-spin_unlock_irq()
	|-worker->current_func(work)
	|-spin_lock_irq()
 	|-worker->current_pwq = NULL
|-spin_unlock_irq()

				//interrupt here
				|-irq_handler
					|-__queue_work()
						//assuming that the wq is draining
						|-is_chained_work(wq)
							|-current_wq_worker()
							//Here, 'current' is the interrupted worker!
								|-current->current_pwq is NULL here!
|-schedule()
----------------------------------------------------------------

Avoid it by checking for task context in current_wq_worker(), and
if not in task context, we shouldn't use the 'current' to check the
condition.

Reported-by: Xiaofei Tan <tanxiaofei@...wei.com>
Signed-off-by: Li Bin <huawei.libin@...wei.com>
Reviewed-by: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Fixes: 8d03ecfe4718 ("workqueue: reimplement is_chained_work() using current_wq_worker()")
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/workqueue_internal.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -9,6 +9,7 @@
 
 #include <linux/workqueue.h>
 #include <linux/kthread.h>
+#include <linux/preempt.h>
 
 struct worker_pool;
 
@@ -59,7 +60,7 @@ struct worker {
  */
 static inline struct worker *current_wq_worker(void)
 {
-	if (current->flags & PF_WQ_WORKER)
+	if (in_task() && (current->flags & PF_WQ_WORKER))
 		return kthread_data(current);
 	return NULL;
 }