Re: [PATCH] media: rockchip: rga: Fix possible ERR_PTR dereference in rga_buf_init()

[Michael Tretter <m.tretter@pengutronix.de>]

On Sat, 27 Dec 2025 11:40:37 +0300, Alper Ak wrote:
> rga_get_frame() can return ERR_PTR(-EINVAL) when buffer type is
> unsupported or invalid. rga_buf_init() does not check the return value
> and unconditionally dereferences the pointer when accessing f->size.
> 
> Add proper ERR_PTR checking and return the error to prevent
> dereferencing an invalid pointer.
> 
> Fixes: 6040702ade23 ("media: rockchip: rga: allocate DMA descriptors per buffer")
> Signed-off-by: Alper Ak <alperyasinak1@gmail.com>

Reviewed-by: Michael Tretter <m.tretter@pengutronix.de>

> ---
>  drivers/media/platform/rockchip/rga/rga-buf.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/media/platform/rockchip/rga/rga-buf.c b/drivers/media/platform/rockchip/rga/rga-buf.c
> index 730bdf98565a..bb575873f2b2 100644
> --- a/drivers/media/platform/rockchip/rga/rga-buf.c
> +++ b/drivers/media/platform/rockchip/rga/rga-buf.c
> @@ -80,6 +80,9 @@ static int rga_buf_init(struct vb2_buffer *vb)
>  	struct rga_frame *f = rga_get_frame(ctx, vb->vb2_queue->type);
>  	size_t n_desc = 0;
>  
> +	if (IS_ERR(f))
> +		return PTR_ERR(f);
> +
>  	n_desc = DIV_ROUND_UP(f->size, PAGE_SIZE);
>  
>  	rbuf->n_desc = n_desc;
> -- 
> 2.43.0
> 
>