[PATCH] ASoC: SOF: Fix function topology name check in profile info output

[Péter Ujfalusi]

On 23/10/2025 09:12, Chen-Yu Tsai wrote:
> The function topology feature, and the plat_data->machine field that
> specifies this feature, is ACPI specific. The check didn't take this
> into consideration, which causes a NULL pointer dereference splat on
> OF platforms:
> 
>     BUG: KASAN: null-ptr-deref in sof_create_ipc_file_profile (sound/soc/sof/fw-file-profile.c:291 sound/soc/sof/fw-file-profile.c:340) snd_sof
>     Read of size 8 at addr 00000000000000c8 by task (udev-worker)/247
> 
>     CPU: 7 UID: 0 PID: 247 Comm: (udev-worker) Not tainted 6.18.0-rc2-next-20251023-03804-g93b191bc0c26-dirty #747 PREEMPT  ba3c303a11d89508de4087cb5b4f8985b6d87b6f
>     Hardware name: Google Ciri sku2 board (DT)
>     Call trace:
>     [KASAN stuff]
>     sof_create_ipc_file_profile (sound/soc/sof/fw-file-profile.c:291 sound/soc/sof/fw-file-profile.c:340) snd_sof
>     snd_sof_device_probe (sound/soc/sof/core.c:304 sound/soc/sof/core.c:388 sound/soc/sof/core.c:460 sound/soc/sof/core.c:719) snd_sof
>     sof_of_probe (sound/soc/sof/sof-of-dev.c:84) snd_sof_of
>      platform_probe (drivers/base/platform.c:1405)
>     [...]
> 
> Check that the ACPI specific field is actually valid before accessing
> it.
> 
> This was seen on a MediaTek based Chromebook.

Acked-by: Peter Ujfalusi <peter.ujfalusi at linux.intel.com>

> 
> Fixes: 2b92b98cc476 ("ASoC: SOF: Don't print the monolithic topology name if function topology may be used")
> Cc: Bard Liao <yung-chuan.liao at linux.intel.com>
> Signed-off-by: Chen-Yu Tsai <wenst at chromium.org>
> ---
>  sound/soc/sof/fw-file-profile.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/sof/fw-file-profile.c b/sound/soc/sof/fw-file-profile.c
> index 4a2afc04f338..76bde2e0be1d 100644
> --- a/sound/soc/sof/fw-file-profile.c
> +++ b/sound/soc/sof/fw-file-profile.c
> @@ -288,7 +288,8 @@ static void sof_print_profile_info(struct snd_sof_dev *sdev,
>  	if (profile->fw_lib_path)
>  		dev_info(dev, " Firmware lib path: %s\n", profile->fw_lib_path);
>  
> -	if (plat_data->machine->get_function_tplg_files && !plat_data->disable_function_topology)
> +	if (plat_data->machine && plat_data->machine->get_function_tplg_files &&
> +	    !plat_data->disable_function_topology)
>  		dev_info(dev, " Topology file:     function topologies\n");
>  	else
>  		dev_info(dev, " Topology file:     %s/%s\n",

-- 
Péter