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From: Christoph Hellwig <[email protected]>
To: [email protected]
Cc: [email protected], [email protected]
Subject: [PATCH 6/6] io_uring: use rcu_dereference in io_close
Date: Wed, 18 May 2022 10:40:05 +0200	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Accessing the file table needs a rcu_dereference_protected().

Signed-off-by: Christoph Hellwig <[email protected]>
---
 fs/io_uring.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c9596d551bd67..2b848a8dfc46c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5984,7 +5984,8 @@ static int io_close(struct io_kiocb *req, unsigned int issue_flags)
 		spin_unlock(&files->file_lock);
 		goto err;
 	}
-	file = fdt->fd[close->fd];
+	file = rcu_dereference_protected(fdt->fd[close->fd],
+			lockdep_is_held(&files->file_lock));
 	if (!file || file->f_op == &io_uring_fops) {
 		spin_unlock(&files->file_lock);
 		file = NULL;
-- 
2.30.2


      parent reply	other threads:[~2022-05-18  8:40 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-18  8:39 sparse fixes for io_uring Christoph Hellwig
2022-05-18  8:40 ` [PATCH 1/6] io_uring: use a rwf_t for io_rw.flags Christoph Hellwig
2022-05-18 12:27   ` Jens Axboe
2022-05-18  8:40 ` [PATCH 2/6] io_uring: don't use ERR_PTR for user pointers Christoph Hellwig
2022-05-18  8:40 ` [PATCH 3/6] io_uring: drop a spurious inline on a forward declaration Christoph Hellwig
2022-05-18  8:40 ` [PATCH 4/6] io_uring: make apoll_events a __poll_t Christoph Hellwig
2022-05-18  8:40 ` [PATCH 5/6] io_uring: consistently use the EPOLL* defines Christoph Hellwig
2022-05-18  8:40 ` Christoph Hellwig [this message]

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