[PATCH][RFC] dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list

[Li RongQing <lirongqing@baidu.com>]

I think when the description is freed, it maybe used again because of
race, then it's next maybe pointer a value that should not be freed

To prevent this, list_for_each_entry_safe should be used.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
 drivers/dma/idxd/irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index 8dc029c..0c7fed7 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -611,7 +611,7 @@ static void irq_process_work_list(struct idxd_irq_entry *irq_entry)
 
 	spin_unlock(&irq_entry->list_lock);
 
-	list_for_each_entry(desc, &flist, list) {
+	list_for_each_entry_safe(desc, n, &flist, list) {
 		/*
 		 * Check against the original status as ABORT is software defined
 		 * and 0xff, which DSA_COMP_STATUS_MASK can mask out.
-- 
2.9.4