From: Pavel Begunkov <asml.silence@xxxxxxxxx>
[ Upstream commit 621fadc22365f3cf307bcd9048e3372e9ee9cdcc ]
In rare cases a task may be exiting while io_ring_exit_work() trying to
cancel/wait its requests. It's ok for __io_sq_thread_acquire_mm()
because of SQPOLL check, but is not for __io_sq_thread_acquire_files().
Play safe and fail for both of them.
Cc: stable@xxxxxxxxxxxxxxx # 5.5+
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/io_uring.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4833b68f1a1cc..6c356b9e87b39 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1009,6 +1009,8 @@ static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx)
{
struct mm_struct *mm;
+ if (current->flags & PF_EXITING)
+ return -EFAULT;
if (current->mm)
return 0;
--
2.27.0
