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Message-Id: <20210712061049.992994867@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:12:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Dmitry Kadashev <dkadashev@...il.com>,
Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.12 696/700] io_uring: add IOPOLL and reserved field checks to IORING_OP_UNLINKAT
From: Jens Axboe <axboe@...nel.dk>
commit 22634bc5620d29765e5199c7b230a372c7ddcda2 upstream.
We can't support IOPOLL with non-pollable request types, and we should
check for unused/reserved fields like we do for other request types.
Fixes: 14a1143b68ee ("io_uring: add support for IORING_OP_UNLINKAT")
Cc: stable@...r.kernel.org
Reported-by: Dmitry Kadashev <dkadashev@...il.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/io_uring.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3548,6 +3548,10 @@ static int io_unlinkat_prep(struct io_ki
struct io_unlink *un = &req->unlink;
const char __user *fname;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index)
+ return -EINVAL;
if (unlikely(req->flags & REQ_F_FIXED_FILE))
return -EBADF;
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