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SubjectRe: [PATCH] fpga: stratix10-soc: fix use-after-free on s10_init()
Hi Wen,

On Wed, Apr 24, 2019 at 07:32:05AM +0800, Wen Yang wrote:
> The refcount of fw_np has already been decreased by of_find_matching_node()
> so it shouldn't be used anymore.
> This patch adds an of_node_get() before of_find_matching_node() to avoid
> the use-after-free problem.
>
> Fixes: e7eef1d7633a ("fpga: add intel stratix10 soc fpga manager driver")
> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> Cc: Alan Tull <atull@kernel.org>
> Cc: Moritz Fischer <mdf@kernel.org>
> Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> Cc: linux-fpga@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org

Reviewed-by: Moritz Fischer <mdf@kernel.org>
> ---
> drivers/fpga/stratix10-soc.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/fpga/stratix10-soc.c b/drivers/fpga/stratix10-soc.c
> index 13851b3..215d337 100644
> --- a/drivers/fpga/stratix10-soc.c
> +++ b/drivers/fpga/stratix10-soc.c
> @@ -507,12 +507,16 @@ static int __init s10_init(void)
> if (!fw_np)
> return -ENODEV;
>
> + of_node_get(fw_np);
> np = of_find_matching_node(fw_np, s10_of_match);
> - if (!np)
> + if (!np) {
> + of_node_put(fw_np);
> return -ENODEV;
> + }
>
> of_node_put(np);
> ret = of_platform_populate(fw_np, s10_of_match, NULL, NULL);
> + of_node_put(fw_np);
> if (ret)
> return ret;
>
> --
> 2.9.5
>

Thanks,
Moritz

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