linux-kernel - Re: [PATCH] virtio: fix reference leak in register_virtio

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Message-ID: <20241217042248.omldhsl4royrfo4o@vireshk-i7>
Date: Tue, 17 Dec 2024 09:52:48 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Ma Ke <make_ruc2021@....com>
Cc: mst@...hat.com, jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com, arnd@...db.de, virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] virtio: fix reference leak in register_virtio_device()

On 17-12-24, 11:54, Ma Ke wrote:
> When device_add(&dev->dev) failed, calling put_device() to explicitly
> release dev->dev. Otherwise, it could cause double free problem.
> 
> Found by code review.
> 
> Cc: stable@...r.kernel.org
> Fixes: 694a1116b405 ("virtio: Bind virtio device to device-tree node")

The fixes tag looks incorrect as the problem must be present before this commit
too.

> Signed-off-by: Ma Ke <make_ruc2021@....com>
> ---
>  drivers/virtio/virtio.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
> index b9095751e43b..ac721b5597e8 100644
> --- a/drivers/virtio/virtio.c
> +++ b/drivers/virtio/virtio.c
> @@ -503,6 +503,7 @@ int register_virtio_device(struct virtio_device *dev)
>  
>  out_of_node_put:
>  	of_node_put(dev->dev.of_node);
> +	put_device(&dev->dev);
>  out_ida_remove:
>  	ida_free(&virtio_index_ida, dev->index);
>  out:
> -- 
> 2.25.1

-- 
viresh