Re: [PATCH v7 3/5] misc: fastrpc: Fail Audio PD init when reserved memory is missing

[Jie Gan <jie.gan@oss.qualcomm.com>]

On 6/2/2026 3:17 PM, Jianping Li wrote:
> Audio PD static process creation assumes that a reserved-memory
> region is defined in DT and exposed via cctx->remote_heap.
> 
> If reserved-memory is missing or incomplete, the driver may pass
> invalid address/size information to the DSP, leading to undefined
> behavior or crashes.
> 
> Add explicit validation for remote_heap presence and size before
> sending the memory to DSP, and fail early if the configuration is
> invalid.
> 
> Fixes: 0871561055e66 ("misc: fastrpc: Add support for audiopd")
> Cc: stable@kernel.org
> Signed-off-by: Jianping Li <jianping.li@oss.qualcomm.com>
> ---
>   drivers/misc/fastrpc.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index a8a58f889d07..f46a8f53970d 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1354,6 +1354,13 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
>   	} inbuf;
>   	u32 sc;
>   
> +	if (!fl->cctx->remote_heap ||
> +	    !fl->cctx->remote_heap->dma_addr ||
> +	    !fl->cctx->remote_heap->size) {
> +		err = -ENOMEM;
> +		dev_dbg(fl->sctx->dev, "remote heap memory region is not added\n");

should be an error instead of dbg info.

Thanks,
Jie

> +		return err;
> +	}
>   	args = kzalloc_objs(*args, FASTRPC_CREATE_STATIC_PROCESS_NARGS);
>   	if (!args)
>   		return -ENOMEM;