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

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>
This commit is contained in:
Jens Axboe 2021-01-23 15:51:11 -07:00
parent 6ee1d745b7
commit 84965ff8a8
1 changed files with 8 additions and 1 deletions
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9
fs/io_uring.c
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@ -1069,8 +1069,12 @@ static bool io_match_task(struct io_kiocb *head,
{
struct io_kiocb *req;
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;
@ -9136,6 +9140,9 @@ 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;