mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
workqueue: Fix NULL pointer dereference
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@huawei.com>
Signed-off-by: Li Bin <huawei.libin@huawei.com>
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 8d03ecfe47
("workqueue: reimplement is_chained_work() using current_wq_worker()")
Cc: stable@vger.kernel.org # v3.9+
This commit is contained in:
parent
692b48258d
commit
cef572ad9b
|
@ -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;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue