From: Joseph Ravichandran <jravi@mit.edu>
Date: Thu, 28 Apr 2022 16:57:52 +0000 (-0400)
Subject: io_uring: fix uninitialized field in rw io_kiocb
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=32452a3eb8b64e01e2be717f518c0be046975b9d;p=linux.git

io_uring: fix uninitialized field in rw io_kiocb

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>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 92ac50f139cde..e3ae26ff5d1ae 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3783,6 +3783,7 @@ 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;