Re: [PATCH] remoteproc: imx_rproc: Adjust phandle parsing issue while remapping optional addresses in imx_rproc_addr_init()

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Thu, Jun 06, 2024 at 10:52:04AM +0300, Aleksandr Mishin wrote:
> In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts
> number of phandles. But phandles may be empty. So of_parse_phandle() in
> the parsing loop (0 < a < nph) may return NULL which is later dereferenced.
> Adjust this issue by adding NULL-return check.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver")
> Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru>
> ---
>  drivers/remoteproc/imx_rproc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 5a3fb902acc9..39eacd90af14 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
>  		struct resource res;
>  
>  		node = of_parse_phandle(np, "memory-region", a);
> +		if (!node)

You're missing an "of_node_put()" before continuing.

> +			continue;
>  		/* Not map vdevbuffer, vdevring region */
>  		if (!strncmp(node->name, "vdev", strlen("vdev"))) {
>  			of_node_put(node);
> -- 
> 2.30.2
> 
>