From: Jens Axboe axboe@kernel.dk
commit e677edbcabee849bfdd43f1602bccbecf736a646 upstream.
io_flush_timeouts() assumes the timeout isn't in progress of triggering or being removed/canceled, so it unconditionally removes it from the timeout list and attempts to cancel it.
Leave it on the list and let the normal timeout cancelation take care of it.
Cc: stable@vger.kernel.org # 5.5+ Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1538,12 +1538,11 @@ static void io_flush_timeouts(struct io_ __must_hold(&ctx->completion_lock) { u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); + struct io_kiocb *req, *tmp;
spin_lock_irq(&ctx->timeout_lock); - while (!list_empty(&ctx->timeout_list)) { + list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { u32 events_needed, events_got; - struct io_kiocb *req = list_first_entry(&ctx->timeout_list, - struct io_kiocb, timeout.list);
if (io_is_timeout_noseq(req)) break; @@ -1560,7 +1559,6 @@ static void io_flush_timeouts(struct io_ if (events_got < events_needed) break;
- list_del_init(&req->timeout.list); io_kill_timeout(req, 0); } ctx->cq_last_tm_flush = seq; @@ -6205,6 +6203,7 @@ static int io_timeout_prep(struct io_kio if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) return -EFAULT;
+ INIT_LIST_HEAD(&req->timeout.list); data->mode = io_translate_timeout_mode(flags); hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode);