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fuse: fix leak of fuse_io_priv

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commit f1ebdeffc6f325e30e0ddb9f7a70f1370fa4b851 upstream.

exit_aio() is sometimes stuck in wait_for_completion() after aio is issued
with direct IO and the task receives a signal.

The reason is failure to call ->ki_complete() due to a leaked reference to
fuse_io_priv.  This happens in fuse_async_req_send() if
fuse_simple_background() returns an error (e.g. -EINTR).

In this case the error value is propagated via io->err, so return success
to not confuse callers.

This issue is tracked as a virtio-fs issue:
https://gitlab.com/virtio-fs/qemu/issues/14

Reported-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Fixes: 45ac96ed7c36 ("fuse: convert direct_io to simple api")
Cc: <stable@vger.kernel.org> # v5.4
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2019-11-25 20:48:46 +01:00 committed by Greg Kroah-Hartman
parent 57aabff8cc
commit a266e9072a
1 changed files with 3 additions and 1 deletions
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4
fs/fuse/file.c
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@ -713,8 +713,10 @@ static ssize_t fuse_async_req_send(struct fuse_conn *fc,
ia->ap.args.end = fuse_aio_complete_req;
err = fuse_simple_background(fc, &ia->ap.args, GFP_KERNEL);
if (err)
fuse_aio_complete_req(fc, &ia->ap.args, err);
return err ?: num_bytes;
return num_bytes;
}
static ssize_t fuse_send_read(struct fuse_io_args *ia, loff_t pos, size_t count,