From: Joseph Qi <joseph.qi@linux.alibaba.com>
Date: Tue, 28 Feb 2023 12:54:59 +0800
Subject: [PATCH] io_uring: fix fget leak when fs don't support nowait buffered
 read
References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: 54aa7f2330b82884f4a1afce0220add6e8312f8b

commit 54aa7f2330b82884f4a1afce0220add6e8312f8b upstream.

Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1]

Do the following steps can reproduce this BUG:
mount -t ocfs2 /dev/vdc /mnt/ocfs2
cp testfile /mnt/ocfs2/
./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1
umount /mnt/ocfs2

Then umount will fail, and it outputs:
umount: /mnt/ocfs2: target is busy.

While tracing umount, it blames mnt_get_count() not return as expected.
Do a deep investigation for fget()/fput() on related code flow, I've
finally found that fget() leaks since ocfs2 doesn't support nowait
buffered read.

io_issue_sqe
|-io_assign_file  // do fget() first
  |-io_read
  |-io_iter_do_read
    |-ocfs2_file_read_iter  // return -EOPNOTSUPP
  |-kiocb_done
    |-io_rw_done
      |-__io_complete_rw_common  // set REQ_F_REISSUE
    |-io_resubmit_prep
      |-io_req_prep_async  // override req->file, leak happens

This was introduced by commit a196c78b5443 in v5.18. Fix it by don't
re-assign req->file if it has already been assigned.

[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t

Fixes: a196c78b5443 ("io_uring: assign non-fixed early for async work")
Cc: <stable@vger.kernel.org>
Reported-by: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230228045459.13524-1-joseph.qi@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 io_uring/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 80ba696e..a4e9dbc7 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1728,7 +1728,7 @@ int io_req_prep_async(struct io_kiocb *req)
 	const struct io_op_def *def = &io_op_defs[req->opcode];
 
 	/* assign early for deferred execution for non-fixed file */
-	if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE))
+	if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE) && !req->file)
 		req->file = io_file_get_normal(req, req->cqe.fd);
 	if (!def->prep_async)
 		return 0;
-- 
2.35.3