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UPSTREAM: io_uring/poll: serialize poll linked timer start with poll removal

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Commit ef7dfac51d upstream.

We selectively grab the ctx->uring_lock for poll update/removal, but
we really should grab it from the start to fully synchronize with
linked timeouts. Normally this is indeed the case, but if requests
are forced async by the application, we don't fully cover removal
and timer disarm within the uring_lock.

Make this simpler by having consistent locking state for poll removal.

Bug: 290270326
Cc: stable@vger.kernel.org # 6.1+
Reported-by: Querijn Voet <querijnqyn@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 24f473769e)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I6632b7d78493b0dfc0fb26204d34823045c03f72
This commit is contained in:
Jens Axboe
2023-06-17 19:50:24 -06:00
committed by Lee Jones
parent 6c695fad68
commit a5e46b0f3c
1 changed files with 4 additions and 5 deletions
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9
io_uring/poll.c
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@@ -993,8 +993,9 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
struct io_hash_bucket *bucket;
struct io_kiocb *preq;
int ret2, ret = 0;
bool locked;
bool locked = true;
io_ring_submit_lock(ctx, issue_flags);
preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket);
ret2 = io_poll_disarm(preq);
if (bucket)
@@ -1006,12 +1007,10 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
goto out;
}
io_ring_submit_lock(ctx, issue_flags);
preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table_locked, &bucket);
ret2 = io_poll_disarm(preq);
if (bucket)
spin_unlock(&bucket->lock);
io_ring_submit_unlock(ctx, issue_flags);
if (ret2) {
ret = ret2;
goto out;
@@ -1035,7 +1034,7 @@ found:
if (poll_update->update_user_data)
preq->cqe.user_data = poll_update->new_user_data;
ret2 = io_poll_add(preq, issue_flags);
ret2 = io_poll_add(preq, issue_flags & ~IO_URING_F_UNLOCKED);
/* successfully updated, don't complete poll request */
if (!ret2 || ret2 == -EIOCBQUEUED)
goto out;
@@ -1043,9 +1042,9 @@ found:
req_set_fail(preq);
io_req_set_res(preq, -ECANCELED, 0);
locked = !(issue_flags & IO_URING_F_UNLOCKED);
io_req_task_complete(preq, &locked);
out:
io_ring_submit_unlock(ctx, issue_flags);
if (ret < 0) {
req_set_fail(req);
return ret;