From da8fab32a712511100e8f872a88f36fa74756cfa Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 8 Mar 2023 09:26:13 -0700 Subject: [PATCH] io_uring/uring_cmd: ensure that device supports IOPOLL commit 03b3d6be73e81ddb7c2930d942cdd17f4cfd5ba5 upstream. It's possible for a file type to support uring commands, but not pollable ones. Hence before issuing one of those, we should check that it is supported and error out upfront if it isn't. Cc: stable@vger.kernel.org Fixes: 5756a3a7e713 ("io_uring: add iopoll infrastructure for io_uring_cmd") Link: https://github.com/axboe/liburing/issues/816 Reviewed-by: Kanchan Joshi Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- io_uring/uring_cmd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index e50de0b6b9f84..18dfc5f6a8b72 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -108,7 +108,7 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) struct file *file = req->file; int ret; - if (!req->file->f_op->uring_cmd) + if (!file->f_op->uring_cmd) return -EOPNOTSUPP; ret = security_uring_cmd(ioucmd); @@ -120,6 +120,8 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) if (ctx->flags & IORING_SETUP_CQE32) issue_flags |= IO_URING_F_CQE32; if (ctx->flags & IORING_SETUP_IOPOLL) { + if (!file->f_op->uring_cmd_iopoll) + return -EOPNOTSUPP; issue_flags |= IO_URING_F_IOPOLL; req->iopoll_completed = 0; WRITE_ONCE(ioucmd->cookie, NULL); -- 2.50.1