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io_uring: if we see flush on exit, cancel related tasks

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[ Upstream commit 84965ff8a84f0368b154c9b367b62e59c1193f30 ]

Ensure we match tasks that belong to a dead or dying task as well, as we
need to reap those in addition to those belonging to the exiting task.

Cc: stable@vger.kernel.org # 5.9+
Reported-by: Josef Grieb <josef.grieb@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2021-02-09 04:47:42 +00:00 committed by Greg Kroah-Hartman
parent d16692a34e
commit f0ff1a95bf
1 changed files with 8 additions and 1 deletions
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9
fs/io_uring.c
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@ -1014,8 +1014,12 @@ static bool io_match_task(struct io_kiocb *head,
{
struct io_kiocb *link;
if (task && head->task != task)
if (task && head->task != task) {
/* in terms of cancelation, always match if req task is dead */
if (head->task->flags & PF_EXITING)
return true;
return false;
}
if (!files)
return true;
if (__io_match_files(head, files))
@ -8844,6 +8848,9 @@ static int io_uring_flush(struct file *file, void *data)
struct io_uring_task *tctx = current->io_uring;
struct io_ring_ctx *ctx = file->private_data;
if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
io_uring_cancel_task_requests(ctx, NULL);
if (!tctx)
return 0;