From: Xiaoguang Wang <[email protected]> commit d8f1b9716cfd1a1f74c0fedad40c5f65a25aa208 upstream.
The prepare_to_wait() and finish_wait() calls in io_uring_cancel_files() are mismatched. Currently I don't see any issues related this bug, just find it by learning codes. Signed-off-by: Xiaoguang Wang <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/io_uring.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6488,11 +6488,9 @@ static int io_uring_release(struct inode static void io_uring_cancel_files(struct io_ring_ctx *ctx, struct files_struct *files) { - struct io_kiocb *req; - DEFINE_WAIT(wait); - while (!list_empty_careful(&ctx->inflight_list)) { - struct io_kiocb *cancel_req = NULL; + struct io_kiocb *cancel_req = NULL, *req; + DEFINE_WAIT(wait); spin_lock_irq(&ctx->inflight_lock); list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { @@ -6532,6 +6530,7 @@ static void io_uring_cancel_files(struct */ if (refcount_sub_and_test(2, &cancel_req->refs)) { io_put_req(cancel_req); + finish_wait(&ctx->inflight_wait, &wait); continue; } } @@ -6539,8 +6538,8 @@ static void io_uring_cancel_files(struct io_wq_cancel_work(ctx->io_wq, &cancel_req->work); io_put_req(cancel_req); schedule(); + finish_wait(&ctx->inflight_wait, &wait); } - finish_wait(&ctx->inflight_wait, &wait); } static int io_uring_flush(struct file *file, void *data)
