[PATCH] ovl: fix file reference leak when submitting aio

[PATCH] ovl: fix file reference leak when submitting aio

[Amir Goldstein]

Commit 724768a39374 ("ovl: fix incorrect fdput() on aio completion")
took a refcount on real file before submitting aio, but forgot to
avoid clearing FDPUT_FPUT from real.flags stack variable.
This can result in a file reference leak.

Fixes: 724768a39374 ("ovl: fix incorrect fdput() on aio completion")
Reported-by: Gil Lev <contact@levgil.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---

Miklos,

This is a fix for an unfortunate braino merged to 6.6-rc2.
I will queue it up for 6.6-rc5.

Gil has caught this bug in post mortem review.
Thanks for reporting the bug!

Amir.


 fs/overlayfs/file.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 693971d20280..8be4dc050d1e 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -341,7 +341,6 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 		if (!aio_req)
 			goto out;
 
-		real.flags = 0;
 		aio_req->orig_iocb = iocb;
 		kiocb_clone(&aio_req->iocb, iocb, get_file(real.file));
 		aio_req->iocb.ki_complete = ovl_aio_rw_complete;
@@ -413,7 +412,6 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 		if (!aio_req)
 			goto out;
 
-		real.flags = 0;
 		aio_req->orig_iocb = iocb;
 		kiocb_clone(&aio_req->iocb, iocb, get_file(real.file));
 		aio_req->iocb.ki_flags = ifl;
-- 
2.34.1