io_uring: fix uninitialized field in rw io_kiocb

[ 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@mit.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 531d0086d0b3387cd0e044539f830bcebebb9b9e..87df37912055120c149898c5d3083064526d8ff1 100644 (file)
--- 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;