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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Subject: [PATCH 3/6] io_uring: don't re-read sqe->off in timeout_prep()
Date: Tue, 26 May 2020 20:34:04 +0300	[thread overview]
Message-ID: <dfb9555d60282d5c8f5eb43d70af0e5980f32ab3.1590513806.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

SQEs are user writable, don't read sqe->off twice in io_timeout_prep()

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e30fc17dd268..067ebdeb1ba4 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4803,18 +4803,19 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 {
 	struct io_timeout_data *data;
 	unsigned flags;
+	u32 off = READ_ONCE(sqe->off);
 
 	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
 		return -EINVAL;
 	if (sqe->ioprio || sqe->buf_index || sqe->len != 1)
 		return -EINVAL;
-	if (sqe->off && is_timeout_link)
+	if (off && is_timeout_link)
 		return -EINVAL;
 	flags = READ_ONCE(sqe->timeout_flags);
 	if (flags & ~IORING_TIMEOUT_ABS)
 		return -EINVAL;
 
-	req->timeout.count = READ_ONCE(sqe->off);
+	req->timeout.count = off;
 
 	if (!req->io && io_alloc_async_ctx(req))
 		return -ENOMEM;
-- 
2.24.0


  parent reply	other threads:[~2020-05-26 17:36 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-26 17:34 [PATCH 0/6] random patches for 5.8 Pavel Begunkov
2020-05-26 17:34 ` [PATCH 1/6] io_uring: fix flush req->refs underflow Pavel Begunkov
2020-05-26 18:04   ` Jens Axboe
2020-05-26 17:34 ` [PATCH 2/6] io_uring: simplify io_timeout locking Pavel Begunkov
2020-05-26 17:34 ` Pavel Begunkov [this message]
2020-05-26 17:34 ` [PATCH 4/6] io_uring: separate DRAIN flushing into a cold path Pavel Begunkov
2020-05-26 17:34 ` [PATCH 5/6] io_uring: get rid of manual punting in io_close Pavel Begunkov
2020-05-26 17:34 ` [PATCH 6/6] io_uring: let io_req_aux_free() handle fixed files Pavel Begunkov
2020-05-26 18:03   ` Jens Axboe
2020-05-26 18:11     ` Pavel Begunkov
2020-05-26 19:32 ` [PATCH 0/6] random patches for 5.8 Jens Axboe

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