linux-kernel - [PATCH 5.17 156/225] io_uring: fix uninitialized field in rw io

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Date:   Wed,  4 May 2022 18:46:34 +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, Joseph Ravichandran <jravi@....edu>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 156/225] io_uring: fix uninitialized field in rw io_kiocb

From: Joseph Ravichandran <jravi@....edu>

[ Upstream commit 32452a3eb8b64e01e2be717f518c0be046975b9d ]

io_rw_init_file does not initialize kiocb->private, so when iocb_bio_iopoll
reads kiocb->private it can contain uninitialized data.

Fixes: 3e08773c3841 ("block: switch polling to be bio based")
Signed-off-by: Joseph Ravichandran <jravi@....edu>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 531d0086d0b3..87df37912055 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3584,6 +3584,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode)
 		if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll)
 			return -EOPNOTSUPP;
 
+		kiocb->private = NULL;
 		kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
 		kiocb->ki_complete = io_complete_rw_iopoll;
 		req->iopoll_completed = 0;
-- 
2.35.1