[PATCH v2 1/2] clk: imx: imx6q: Fix device node reference leak in pll6_bypassed()

[Frank Li]

On Sat, Jan 31, 2026 at 04:11:34PM +0800, Felix Gu wrote:
> The function pll6_bypassed() calls of_parse_phandle_with_args()
> but never calls of_node_put() to release the reference, causing
> a memory leak.
>
> Fix this by adding proper cleanup calls on all exit paths.
>
> Fixes: 3cc48976e9763 ("clk: imx6q: handle ENET PLL bypass")
> Signed-off-by: Felix Gu <ustc.gu at gmail.com>
> ---
>  drivers/clk/imx/clk-imx6q.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/imx/clk-imx6q.c b/drivers/clk/imx/clk-imx6q.c
> index bf4c1d9c9928..1d8e8f0891a3 100644
> --- a/drivers/clk/imx/clk-imx6q.c
> +++ b/drivers/clk/imx/clk-imx6q.c
> @@ -238,8 +238,11 @@ static bool pll6_bypassed(struct device_node *node)
>  			return false;
>
>  		if (clkspec.np == node &&
> -		    clkspec.args[0] == IMX6QDL_PLL6_BYPASS)
> +		    clkspec.args[0] == IMX6QDL_PLL6_BYPASS) {
> +			of_node_put(clkspec.np);
>  			break;
> +		}
> +		of_node_put(clkspec.np);
>  	}
>
>  	/* PLL6 bypass is not part of the assigned clock list */
> @@ -249,6 +252,7 @@ static bool pll6_bypassed(struct device_node *node)
>  	ret = of_parse_phandle_with_args(node, "assigned-clock-parents",
>  					 "#clock-cells", index, &clkspec);
>

If ret is err, clkspec will not touched. So clkspec.np keep old value,
of_node_put(clkspec.np) will put twice for previous np.

So need add if (ret) check here. Or use difference variable clkspec with
init 0.

Frank

> +	of_node_put(clkspec.np);
>  	if (clkspec.args[0] != IMX6QDL_CLK_PLL6)
>  		return true;
>
>
> --
> 2.43.0
>