From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pavel Begunkov <asml.silence@gmail.com>,
Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>,
linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org
Subject: [PATCH AUTOSEL 5.10 23/39] io_uring: fix ->flags races by linked timeouts
Date: Thu, 25 Mar 2021 07:25:42 -0400 [thread overview]
Message-ID: <20210325112558.1927423-23-sashal@kernel.org> (raw)
In-Reply-To: <20210325112558.1927423-1-sashal@kernel.org>
From: Pavel Begunkov <asml.silence@gmail.com>
[ Upstream commit efe814a471e0e58f28f1efaf430c8784a4f36626 ]
It's racy to modify req->flags from a not owning context, e.g. linked
timeout calling req_set_fail_links() for the master request might race
with that request setting/clearing flags while being executed
concurrently. Just remove req_set_fail_links(prev) from
io_link_timeout_fn(), io_async_find_and_cancel() and functions down the
line take care of setting the fail bit.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 691c99869143..8f57fd328df6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6231,7 +6231,6 @@ static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
spin_unlock_irqrestore(&ctx->completion_lock, flags);
if (prev) {
- req_set_fail_links(prev);
io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME);
io_put_req(prev);
} else {
--
2.30.1
next prev parent reply other threads:[~2021-03-25 11:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 11:25 [PATCH AUTOSEL 5.10 01/39] virtiofs: Fail dax mount if device does not support it Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 08/39] iomap: Fix negative assignment to unsigned sis->pages in iomap_swapfile_activate Sasha Levin
2021-03-25 11:25 ` Sasha Levin [this message]
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 34/39] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Sasha Levin
2021-03-25 11:25 ` [PATCH AUTOSEL 5.10 39/39] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Sasha Levin
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