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* [PATCH] io_uring: fix fget leak when fs don't support nowait buffered read
@ 2023-02-28  4:54 Joseph Qi
  2023-02-28 12:59 ` Jens Axboe
  0 siblings, 1 reply; 2+ messages in thread
From: Joseph Qi @ 2023-02-28  4:54 UTC (permalink / raw)
  To: Jens Axboe; +Cc: io-uring, ocfs2-devel, Heming Zhao, Xiaoguang Wang

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/[email protected]/T/#t

Fixes: a196c78b5443 ("io_uring: assign non-fixed early for async work")
Cc: <[email protected]>
Reported-by: Heming Zhao <[email protected]>
Signed-off-by: Joseph Qi <[email protected]>
Cc: Xiaoguang Wang <[email protected]>
---
 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 1df68da89f99..7ad3b8af2a4b 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1777,7 +1777,7 @@ int io_req_prep_async(struct io_kiocb *req)
 	const struct io_issue_def *def = &io_issue_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 (!cdef->prep_async)
 		return 0;
-- 
2.24.4


^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] io_uring: fix fget leak when fs don't support nowait buffered read
  2023-02-28  4:54 [PATCH] io_uring: fix fget leak when fs don't support nowait buffered read Joseph Qi
@ 2023-02-28 12:59 ` Jens Axboe
  0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2023-02-28 12:59 UTC (permalink / raw)
  To: Joseph Qi; +Cc: io-uring, ocfs2-devel, Heming Zhao, Xiaoguang Wang


On Tue, 28 Feb 2023 12:54:59 +0800, Joseph Qi wrote:
> 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
> 
> [...]

Applied, thanks!

[1/1] io_uring: fix fget leak when fs don't support nowait buffered read
      commit: 54aa7f2330b82884f4a1afce0220add6e8312f8b

Best regards,
-- 
Jens Axboe




^ permalink raw reply	[flat|nested] 2+ messages in thread

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